Best AI agents for research (2026)
Agents that search, read many sources and come back with a cited answer or report. We list 176 tools for research below, each with a link-checked page, pricing as the maker states it and alternatives.
Updated
176 tools: 81 open source, 3 source-available, 47 free or freemium, 30 paid, usage-based or enterprise, 15 pricing on the maker's site.
Research and reports (63) See the full list →
OpenComputer
OpenComputer is a platform for building and deploying long-running AI agents as code. You define an agent as a TypeScript function with its model, tools and MCP servers, deploy it with one command, and every session gets its own real cloud computer, with managed sessions, schedules and API keys kept outside the agent's runtime. Templates include a coding agent that edits a repo, runs checks and opens a draft pull request, and market-research and GTM agents; its own Slack coding agent runs on it. Pricing is pay-as-you-go for model calls and per-second machine time.
Added
Bidhelm
Bidhelm is an AI marketing department that runs a company's marketing for it. It researches markets and competitors, writes ad copy and creates ad assets, builds landing pages with lead forms, and runs Google Ads campaigns and X posting every day, managing bids, keywords and budget. It learns from campaign results, moves budget to what works and reports every change it made and why, so owners can steer it in plain language instead of operating ad tools.
Added
AutoScientists
A research system from Harvard's Zitnik lab where teams of LLM agents self-organize to plan and run long-running scientific experiments.
Added
Open Executive
A self-hostable virtual executive: one executive persona backed by a team of specialist agents that handle planning, research, communication and follow-ups for a founder or manager.
Added
Growth Lab
An open-source growth agent that learns your product, gathers data, researches the market, runs growth experiments and learns from the results to pick the next move.
Added
Grok Bot Jev Router
Grok Bot Jev Router is an open-source Python reference router that puts TypeSafe Jev in front of Grok Bot as a cheap decision layer. Before expensive research, browser, retry or subagent work, Jev classifies the request and returns an explicit action such as reuse a cached result, stop a failing retry, cap research, run a deterministic step, or ask a human. It starts in shadow mode that only logs decisions, has an active mode for a Grok Bot skill that honors them, and includes a kill switch. It never sends, pays or deletes anything itself.
Added
Bottally
Bottally is an AI marketing agent for SEO and AEO that runs on autopilot. Once you connect your blog (WordPress, Webflow, Ghost, Shopify, Wix, Notion, Framer, Next.js or a webhook), it researches keywords and competitor gaps, then writes and publishes one researched article a day with images. It also offers an opt-in backlink exchange network and tracks weekly whether ChatGPT, Google AI Mode, Google AI Overviews and Perplexity recommend your business.
Added
open-kritt
A self-hosted AI security research tool that orchestrates agents to hunt for vulnerabilities in a codebase and then validate and rank what they find; managed scans are also offered.
Added
LLM for Zotero
Zotero plugin that adds a research agent to your library so you can ask questions about papers, compare sources and save notes without leaving the reader.
Added
Paper Search MCP
MCP server and CLI that searches and downloads academic papers from arXiv, PubMed, bioRxiv, Semantic Scholar and other sources for research agents.
Added
Raven
Host agent that plans complex jobs as task graphs and coordinates built-in and third-party agents for research, coding, design and on-call work.
Added
FlexQueries
FlexQueries is a hosted MCP server and REST API for SEO and AI-visibility research (keywords, SERPs, backlinks, competitors, rankings, site audits) that connects to Claude, ChatGPT, Cursor and Codex over OAuth, billed with prepaid credits that never expire.
Added
EvoScientist
Self-evolving AI scientist system that autonomously explores research ideas, runs experiments and improves with growing skills and memory.
Added
DeepAnalyze
Agentic LLM from Renmin University that autonomously runs data science pipelines and produces analyst-grade research reports.
Added
Hyperresearch
Deep research harness that turns Claude Code or Codex into a research agent building a persistent, searchable wiki, with a hosted API and MCP.
Added
MLE-Agent
Pairing agent for ML engineers and researchers that builds baselines, plans with arXiv and Papers with Code, and works through Kaggle tasks.
Added
Consensus
AI academic search engine over peer-reviewed literature for finding, organizing and analyzing scientific research.
Added
Extruct AI
Company research API for AI that finds and researches companies from a 10M-company index or the live web, with sources.
Added
Gemini Notebook
Google's AI research tool, formerly NotebookLM, that analyzes the sources you upload and turns them into summaries, answers and new formats.
Added
AIOS
Research AI agent operating system that handles scheduling, context switching, memory, storage and tool management for LLM-based agents.
Added
FrontierAgent
Open-source agent runtime and terminal app for long-horizon research and file work, with single-agent ReAct and parallel agent-team modes.
Added
AutoDev
Multi-agent development platform built on Kotlin Multiplatform for research, coding, review and data queries across IntelliJ, VS Code, CLI and more.
Added
Parallel Search MCP
Parallel's MCP servers for web search and deep-research tasks built for AI agents.
Added
Clay
Go-to-market data platform for enriching leads and running agentic research workflows and outreach plays.
Added
Frase MCP
Frase's MCP server with SEO, GEO and AI visibility tools to research, write, optimize, publish and monitor content.
Added
Genspark
All-in-one AI workspace whose agents research and produce slides, docs, sheets, images, video and code for you.
Added
Liner MCP
Liner's MCP server for real-time web and scholarly search with cited answers and multi-step deep research.
Added
Scite MCP
Scite's MCP server that grounds AI answers in scientific literature, with full-text search and citation-based trust signals.
Added
Serpstat MCP
Serpstat's MCP server for automating SEO tasks such as keyword research, competitor analysis and audits.
Added
Skywork
AI workspace agents that turn a prompt into docs, slides, sheets, podcasts and web pages backed by deep research.
Added
vidIQ MCP
vidIQ's MCP server for researching and creating content for YouTube, Instagram and TikTok from an AI assistant.
Added
Paper2Agent
Multi-agent system that turns a research paper and its code into a working MCP server and agent skills you can query and run.
Added
TwelveLabs Jockey MCP
TwelveLabs' hosted MCP server for Jockey, a video-understanding agent that searches, tracks entities and answers questions across your videos and images with clip citations.
Added
Hermes Agent (Nous Research)
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.
Added
Deer Flow
ByteDance's open-source long-horizon agent harness that researches, codes and creates using sandboxes, memory and sub-agents.
Added
STORM
Stanford system that writes Wikipedia-style articles from web research.
Added
GPT Researcher
Autonomous agent that researches the web and writes cited reports.
Added
SurfSense
Privacy-focused, open-source NotebookLM alternative with a research agent over your sources.
Added
Feynman
Open-source research agent that searches, reads papers and writes cited reports.
Added
Deep Research (u14)
Deep research app that works with any LLM and exposes an API and MCP server.
Added
MiroFlow
Research agent framework with web UI supporting MiroThinker and other models.
Added
CoChat
AI research agents that gather verified sources and organize findings.
Added
Elicit
Research assistant that finds and summarizes academic papers.
Added
DeepCode
Open agentic coding system that turns papers and specs into code with multi-agent orchestration.
Added
Magentic-UI
Microsoft Research's experimental human-in-the-loop agent that works across the browser and local files.
Added
MiroThinker
Deep research agent and open models tuned for complex research and forecasting tasks.
Added
Voyager
Research agent that explores Minecraft on its own, writing and reusing code skills to learn as it goes.
Added
Kun
Local-first agent workspace for coding, writing, design, research and automation.
Added
Zotero MCP
MCP server that connects your Zotero research library to Claude and other assistants.
Added
arXiv MCP Server
MCP server for searching and reading arXiv papers.
Added
IBM CUGA
IBM Research's configurable generalist agent (CUGA) for enterprise web and API tasks, with a live demo on Hugging Face Spaces.
Added
Hugging Face MCP Server
Hugging Face's MCP server connecting agents to the Hub's models, datasets, papers and Gradio Spaces.
Added
Imbue
AI research company building tools for coding agents, including Sculptor for running parallel agents.
Added
Lune Research
MCP server that grounds AI agents in full-text computer science research papers.
Added
11x
Digital AI workers for go-to-market teams, including an SDR agent that researches prospects and runs outbound and a phone agent that handles calls.
Added
blai
AI crypto advisor app to research tokens, build portfolios and trade via chat.
Added
Crewdle
Hire autonomous agents and teams for support, sales, bookkeeping and research, paid per task.
Added
ElizaOS
Open-source TypeScript agent operating system with wallet and on-chain plugins, maintained by Eliza Research.
Added
Ludo.ai
AI assistant for game designers: market research, concept ideas, game design docs and asset generation.
Added
Manus
General-purpose autonomous agent that does research and tasks in a cloud computer.
Added
Ninja AI
All-in-one AI assistant with research, coding and writing agents.
Added
Surf AI
AI research assistant for crypto (and now US equities) built on on-chain, market and social data.
Added
CustomGPT.ai
No-code platform for building AI agents grounded in your business content, with citations and anti-hallucination controls.
Added
RAG and documents (14) See the full list →
Claude Scientific Writer
K-Dense's general-purpose scientific writing agent for Claude that drafts research papers and documents.
Added
MemFree
Hybrid AI search engine that answers from your knowledge base and the web, and generates UI pages.
Added
ScrapeGraphAI
Python library that uses LLMs and graph logic to build scraping pipelines: describe the data you want and it extracts it from websites or documents.
Added
SimpleMem
Research-backed lifelong memory library for LLM agents that stores, compresses and retrieves text and multimodal memories, usable over MCP.
Added
Grounded Docs MCP
Self-hosted MCP server that indexes up-to-date documentation from websites, GitHub, npm and PyPI so coding agents query the right version.
Added
Brandfetch MCP
Brandfetch's MCP server for searching brands and retrieving logos, design assets and company data.
Added
Altmetric MCP
Altmetric's MCP server for tracking research attention across news, policy documents and social media.
Added
Lucid MCP
Lucid's MCP connector for creating, searching, editing and sharing Lucidchart and Lucid documents from AI tools.
Added
MindsHub
MindsDB's agent workspace for research, analysis, documents and coding, with a model router, a scoped vault for connected data and swappable open-source agent harnesses.
Added
Google Deep Review
Google Research's multi-agent system that checks research papers, design docs, and legal or financial documents for logical gaps and unsupported claims.
Added
Hebbia
AI platform for finance and legal teams that runs agents across large document sets.
Added
Crawl4AI
Open-source crawler that turns websites into clean, LLM-ready Markdown for agents and RAG pipelines.
Added
LobsterAI
NetEase Youdao's desktop agent for data analysis, slides, documents and web research.
Added
Ref
Token-efficient documentation search for coding agents.
Added
SQL and databases (12) See the full list →
Memgraph
In-memory graph database used as the graph layer for GraphRAG pipelines and agent memory, with Cypher queries plus vector and text search.
Added
AskYourDatabase
Chat-with-your-database tool that answers natural-language questions over Postgres, MySQL, BigQuery, Snowflake and more with SQL and charts.
Added
Fabi.ai
Discontinued: the AI data analysis platform that combined SQL, Python and AI shut down in 2026 after its team joined Omni (announced May 26, 2026); app.fabi.ai now shows a shutdown notice.
Added
txtai
All-in-one Python framework for semantic search, LLM orchestration and agents built on an embeddings database of vector, graph and relational indexes.
Added
OpenScience
Research agent workbench that reads the literature, writes and runs code and experiments and logs every step, with skills and connectors for databases like PubMed, UniProt and arXiv.
Added
WrenAI
Generative BI for agents: governed text-to-SQL with a semantic context layer.
Added
Kuration AI
Builds and maintains your own B2B database with AI agents that pull from registers, trade shows and maps.
Added
Chroma
Open-source search and vector database widely used for agent memory and RAG.
Added
LanceDB
Open-source multimodal vector database for search, RAG and agent memory.
Added
Activeloop
Deep Lake, a multimodal database for AI that stores vectors, images, text and video so agents and RAG apps can search and retrieve them.
Added
seekdb
AI-native search database for agent storage combining vector, text and structured data.
Added
Notion MCP
Notion's official hosted MCP server that lets AI agents search, read and update pages and databases in your workspace.
Added
Scraping and crawling (11) See the full list →
Xquik
Xquik is an X (Twitter) data service for searching and extracting tweets, replies, followers and profiles, monitoring accounts and posting, over REST, an OAuth MCP server and SDKs; pay-as-you-go from $10 or monthly plans from $20.
Added
Moli
Lightweight Rust headless browser for AI agents that fetches pages, searches and extracts content, usable via CLI, CDP or WebDriver.
Added
Kagi MCP
Official Kagi MCP server with search and page-extraction tools backed by the Kagi API.
Added
Apify
Marketplace of thousands of ready-to-run scrapers and automation tools ("Actors") for real-time web data, usable from apps and AI agents, including via MCP.
Added
Firecrawl
Turns websites into clean, LLM-ready data for agents.
Added
Tavily
Search and extraction API tuned for agents.
Added
Maxun
Turns websites into structured APIs with no-code robots for extraction and monitoring.
Added
Apify MCP Server
Apify's MCP server giving agents access to thousands of scrapers for social media, search and maps.
Added
Wigolo
Local-first web search, fetch and crawl for coding agents over MCP, with no API keys.
Added
Bright Data MCP
Bright Data's MCP server for web search, scraping and browsing.
Added
Context.dev
Web data API for AI agents that scrapes pages to Markdown, searches the web and crawls sites.
Added
Search APIs (6)
AnySearch
A search MCP server and API for AI agents, covering real-time web search, vertical search and parallel batch queries with structured results and anonymous access.
Added
AgentKey
One MCP install that gives AI agents live web search, X, Reddit and YouTube data, web page reading and market and token-price data, all paid from a single monthly credit subscription.
Added
Exa
Search API built for AI agents.
Added
Brave Search MCP
Brave's official MCP server for web, image, video, news and local search through the Brave Search API.
Added
SearXNG MCP
MCP server for private web search through SearXNG.
Added
Linkup MCP
Linkup's MCP server for real-time, source-backed web search.
Added
Trading agents (5)
1inch MCP
1inch's MCP server for doc search, intent and cross-chain swaps, limit orders, portfolio data, spot prices and gas.
Added
Vibe-Trading
Open-source personal trading agent for researching markets and testing strategies in natural language.
Added
HeyAnon
Conversational DeFi agent that executes swaps, bridges and research across chains.
Added
Laika AI
Polymetric by Laika AI: AI research, whale tracking and a screener for Polymarket prediction markets (formerly a Web3 research extension).
Added
Nansen AI
On-chain analytics with an AI agent that researches tokens and wallets and can execute trades, powered by 500M+ labeled addresses.
Added
More tools (65)
trivago MCP
trivago MCP is trivago's official remote MCP server for hotel search. Ask an AI assistant about a destination, dates and guests, and it returns live hotel prices compared across hundreds of booking sites in one tool call, with a map widget in ChatGPT. It needs no API key and connects in about a minute to Claude, ChatGPT, Cursor, VS Code and any client that reads the MCP Registry.
Added
OpenOSINT
An open-source OSINT engine with about 20 passive investigation tools usable from a CLI, a web UI or an MCP server for AI assistants, with hosted monitoring and due-diligence plans.
Added
Agentic Scientist
Sakana AI's open-source pipeline that turns coding agents such as Claude Code, Codex, Cursor and Gemini CLI into AI scientists: from a task file they propose ideas, run and score experiments and ablations, then write the paper.
Added
OpenCity Record
OpenCity Record makes US city council and planning meetings searchable in plain language: what was decided, who voted and what is coming up, drawn from meeting transcripts, agendas and ordinances across hundreds of cities. Connect it to Claude, ChatGPT or Cursor through its remote MCP server and ask questions about your local government, with every answer citing the meeting it came from.
Added
KiwiFS
A markdown filesystem for agents and teams: searchable, structured and versioned knowledge in a single binary that agents can read and write.
Added
Algolia MCP
Algolia's official MCP server that lets assistants search and manage Algolia indices, check analytics and tune relevance through natural-language requests.
Added
The Commons (Dead Brands Collab Hub)
The Commons is an open discussion hub for AI agents and bots, run as a remote MCP server (Streamable HTTP) by Dead Brands. Agents can read rooms, threads, search and bot profiles anonymously, and post, reply, upvote and send presence heartbeats with a free, instant hub key they claim themselves through the hub_register tool. Rooms include introductions, lobby, build-log, help-desk and meta, with public moderation, newcomer rate limits and an AI judge that holds prompt-injection bait aimed at visiting bots.
Added
VirtualBudz BudBot
VirtualBudz BudBot is an AI budtender for cannabis dispensary websites. It answers shoppers' product questions, recommends items from the live menu and builds carts around the clock, so customers get help even when staff are busy.
Added
Zapia
A personal AI assistant on WhatsApp, iPhone, Android and the web that books, reminds, searches, compares prices and handles everyday errands for you. Free plan plus Pro and Ultra.
Added
Webcmd
Browser layer for AI agents that learns how each website works as agents use it and saves that as local memory to make later runs faster and cheaper.
Added
AWorld
Agent harness from inclusionAI for building expert agents that search, reproduce and improve on ideas with their own tools and memory.
Added
RobotTraining.jobs
Free job board and remote MCP server for paid robot-training work (teleoperation, demonstration recording, AV and drone test operations): AI assistants can search open roles, hourly pay and hiring data with no key or account.
Added
AIDE ML
Tree-search agent that drafts, debugs and benchmarks machine-learning code until a target metric is optimized.
Added
Dot
AI data analyst that answers data questions, runs root-cause analysis and sends automated reports.
Added
Hex
Analytics platform for humans and agents, with conversational analytics, notebooks and context management for data teams.
Added
Claude Context
Zilliz MCP plugin that adds semantic code search to Claude Code and other coding agents, using your whole codebase as context.
Added
Desktop Commander MCP
MCP server that gives Claude and other clients terminal control, process management, file search and diff-based file editing on your computer.
Added
21st Magic MCP
MCP server from 21st.dev that lets Cursor, Claude Code and Windsurf search and generate React and Tailwind UI components inside the editor.
Added
SocratiCode
Codebase context engine for AI agents with hybrid semantic search, dependency graphs and impact analysis, available as MCP, plugin or skill.
Added
Sidekick
Native macOS app for chatting offline with a local LLM that can draw on your files, folders and websites.
Added
idealo MCP
idealo's MCP server for searching products, comparing prices and finding deals across six European markets.
Added
Whimsical MCP
Whimsical's MCP server for creating and editing flowcharts, mind maps, wireframes and docs, or searching your workspace.
Added
daily.dev MCP
daily.dev's MCP server for developer news feeds, posts, bookmarks, tags and search.
Added
Egnyte MCP
Egnyte's remote MCP server for secure AI search, upload and file management in your Egnyte account.
Added
Fellou
Agentic browser that carries out multi-step tasks across websites, runs deep searches and turns results into reports.
Added
Fireflies MCP
Fireflies.ai MCP server for searching and analyzing meeting transcripts, summaries, soundbites and analytics.
Added
Glean
Enterprise AI platform connected to company data, with search, an assistant and agents that find information and automate work.
Added
HappyScribe MCP
HappyScribe's MCP server for searching, reading, analyzing and creating transcripts and meeting notes.
Added
HARPA AI
Chrome extension browser agent that combines models like GPT, Claude and Gemini to automate web tasks, searching, writing and summarizing.
Added
Hello Retail MCP
Hello Retail's MCP server for setting up and tuning e-commerce search, recommendations, email and product agents.
Added
Icons8 MCP
Icons8 MCP server for searching and fetching Icons8 icons and Ouch illustrations as SVG, PNG or animations.
Added
Kadoa
AI agents that build, monitor and maintain web data pipelines producing verified datasets for investors.
Added
Origami Agents
AI growth agent that finds ways to get customers for your website and runs the approved campaigns.
Added
SE Ranking MCP
SE Ranking's MCP server for keyword, backlink, SERP, audit, rank-tracking and AI search visibility data.
Added
Shortwave
AI email client with an agent that organizes, writes, searches and schedules from a prompt.
Added
Skiplagged MCP
Skiplagged's MCP server for flight search, hotel booking and travel planning from AI assistants.
Added
WordLift Agent
WordLift's AI SEO agent that works on your site's content and knowledge graph to improve search visibility.
Added
REA
MCP server and CLI that lets coding agents reverse engineer native binaries, Electron and JavaScript apps, .NET assemblies and live websites, using Ghidra, Hopper or IDA under the hood.
Added
NVIDIA VSS Blueprint
NVIDIA reference blueprint for video AI agents that search, summarize, answer questions and raise alerts over live or recorded video, with agent skills that assemble deployments from one prompt.
Added
Stack Overflow MCP
Official remote MCP server that lets coding agents search and pull vetted Stack Overflow questions and answers, with a free daily call allowance per user.
Added
Valossa Assistant MCP
EU-based video AI MCP server that lets Claude and other agents upload and search videos and pull transcripts, visual scenes, soundbites and ready-made clips.
Added
Agent-Reach
Lets an AI agent read and search sites like X, Reddit, YouTube and GitHub through one toolkit, without paid APIs.
Added
Vane
Open-source AI answering engine that searches the web and replies with sources, self-hostable.
Added
DB-GPT
Open-source agentic data assistant for querying and analyzing data with LLMs.
Added
PipesHub
Open-source context layer that indexes company knowledge for AI agents and search.
Added
Bruin
Open-source, AI-powered data platform covering ingestion, pipelines and quality checks.
Added
ToolUniverse
Harvard's collection of scientific tools for AI scientist agents.
Added
Anamap
AI analytics agent that investigates conversion and revenue changes using your data and release history.
Added
Dashworks
AI assistant that answers questions from your company's apps and knowledge.
Added
Kater
AI data analyst that answers business questions from your data warehouse.
Added
Querri
AI data analyst that cleans scattered data and answers questions in plain English.
Added
Career Ops
Open-source job search agent that scans job boards and scores each posting against your CV before you apply.
Added
OpenCLI
Turns websites into CLI commands and lets agents use your logged-in browser.
Added
Screenpipe
Records your screen and audio locally so AI agents can search and act on your computer history.
Added
DocsGPT
Private AI platform for agents, assistants and enterprise search with an agent builder.
Added
Semble
Fast code search for agents that uses far fewer tokens than grep and file reads.
Added
Unbrowse
Turns websites into APIs agents can call.
Added
Amplitude MCP
Amplitude's MCP server for searching and analyzing product analytics data from an agent.
Added
Vercel MCP
Vercel's official MCP server for searching docs and managing projects and deployments.
Added
Ami by AiSDR
AI go-to-market agent from AiSDR that builds a target list and runs a live outbound campaign from your website.
Added
Canva MCP
Canva's MCP server for creating, searching, editing and exporting designs from AI assistants.
Added
Clara AI SDR
Face-to-face video AI SDR that talks to website visitors, qualifies leads and books meetings.
Added
kōdlo
Sales workspace whose agent finds prospects and drafts outreach, decks and searches; has an MCP server.
Added
Proof x401
Open HTTP protocol and MCP server that let a website ask an AI agent to prove who it is acting for and have the person cryptographically sign the exact transaction terms, using Proof's agent identity wallet.
Added
TinyFish
Enterprise web agents that run at scale across websites to gather data and take actions.
Added
GitHub repos (100)
| Repo | GitHub stars | Licence | Last push |
|---|---|---|---|
| REA ↗ | 301,645 | MIT | 2026-10-21 |
| Hermes Agent (Nous Research) ↗ | 253,590 | MIT | 2026-10-21 |
| Agent-Reach ↗ | 98,176 | MIT | 2026-10-07 |
| Crawl4AI ↗ | 85,667 | Apache License 2.0 | 2026-10-20 |
| Deer Flow ↗ | 83,959 | MIT | 2026-10-21 |
| Career Ops ↗ | 75,234 | MIT | 2026-10-21 |
| MindsHub ↗ | 39,800 | MIT | 2026-10-19 |
| Vane ↗ | 37,364 | MIT | 2026-09-01 |
| Vibe-Trading ↗ | 35,643 | MIT | 2026-10-21 |
| ScrapeGraphAI ↗ | 31,882 | MIT | 2026-10-06 |
| STORM ↗ | 31,627 | MIT | 2025-09-30 |
| OpenCLI ↗ | 30,335 | Apache License 2.0 | 2026-10-20 |
| GPT Researcher ↗ | 30,082 | Apache License 2.0 | 2026-10-10 |
| Chroma ↗ | 29,512 | Apache License 2.0 | 2026-10-17 |
| Screenpipe ↗ | 21,958 | Screenpipe Commercial License (All rights reserved) | 2026-10-21 |
Top 15 of 100 by stars. Stars and licence come from each repo, checked when the listing was last verified.
Related tasks
Popular with: Marketers · Researchers · Content creators · Related searches: Open-source AI research agents · AI research assistants (ready to use) · Free AI research agents
Tools are matched to tasks by category, use cases and what each tool says it does. Missing one? Submit it free.