Most-Starred Open-Source AI Agent Projects (2026)
The open-source AI agent projects in our directory with the most GitHub stars, across every category. Below are the top 25 of 811 matching tools in the AgentScout directory, ranked.
Updated
How we ranked: Ranked by GitHub stars as recorded on each AgentScout listing (link checks 2026-10-21). Tools without a tracked public repo come after, in alphabetical order. Stars measure developer popularity, not quality or fit for your job, so read each listing before you choose. No paid placements.
Quick comparison Top 10 of 25 listed below. Pricing as the maker states it; blank means we don't have it.
| Tool | Pricing | Best for | Open source |
|---|---|---|---|
 OpenClaw | Open source | Automate workflows | Yes |
 REA | Open source | Write code | Yes |
 Hermes Agent (Nous Research) | Open source | Build an agent | Yes |
 DeepSeek Harness | Open source | Build an agent | Yes |
 opencode | Open source | Write code | Yes |
 MarkItDown | Open source | Connect tools via MCP | Yes |
 Ollama | Open source | Yes | |
 Langflow | Open source + cloud | Write code | Yes |
 CC Switch | Open source | Write code | Yes |
 ComfyUI | Open source + cloud | Generate video | Yes |
1. OpenClaw
Open-source personal agent you run yourself and reach over chat apps.
Pricing (as stated): Open source · Active
2. 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.
Pricing (as stated): Open source · Mature
3. Hermes Agent (Nous Research)
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.
Pricing (as stated): Open source · Active, frequent releases
4. DeepSeek Harness
DeepSeek's open-source agent harness with a local web UI, built so that every tool, model and scheduled task is a swappable plugin; still a developer preview.
Pricing (as stated): Open source · Mature
5. opencode
Open-source terminal coding agent that works with many model providers.
Pricing (as stated): Open source · Active
6. MarkItDown
Microsoft's Python tool and MCP server that converts PDFs, Office documents, images, audio and web pages to Markdown for LLM and agent pipelines.
Pricing (as stated): Open source · Mature
7. Ollama
Runs open models such as Qwen, Gemma, DeepSeek and gpt-oss locally or in Ollama's cloud, and connects them to agents like Claude Code, OpenClaw and Codex.
Pricing (as stated): Open source · Mature
8. Langflow
Visual drag-and-drop builder for AI agents and workflows that you can run locally, deploy as an API or expose as an MCP server.
Pricing (as stated): Open source + cloud · Mature
9. CC Switch
Desktop manager for Claude Code, Codex, Gemini CLI, OpenCode, OpenClaw and other coding agents that switches API providers in one click and manages MCP servers, skills and prompts.
Pricing (as stated): Open source · Mature
10. ComfyUI
Node-based open-source engine for image and video generation workflows. Run models like Wan, LTX and Hunyuan locally or in Comfy Cloud, with an agent that builds workflows.
Pricing (as stated): Desktop app free and open source (GPL-3.0); Comfy Cloud Standard $20/mo ($16 yearly), Creator $35/mo, Pro $100/mo, Team $700/mo · Active
11. OpenAI Codex CLI
OpenAI's open-source coding agent for the terminal; also runs in the cloud.
Pricing (as stated): Open source; uses ChatGPT plan or API · Mature
12. Graphify
Turns a codebase plus its docs, SQL schemas, configs and PDFs into a knowledge graph that coding agents can query.
Pricing (as stated): Open source · Mature
13. Browser Use
Library that lets AI agents control a web browser.
Pricing (as stated): Open source + paid cloud · Mature
14. Immich
Self-hosted photo and video library with AI face recognition and smart search, a private alternative to Google Photos.
Pricing (as stated): Free and open source (AGPL-3.0), self-hosted · Active
15. Pi
Minimal, extensible open-source terminal coding agent and agent toolkit from Earendil, with a multi-provider LLM API, TypeScript SDK, RPC mode and installable extensions, skills and themes.
Pricing (as stated): Open source (MIT); bring your own model provider or subscription · Mature
16. Gemini CLI
Google's open-source terminal agent powered by Gemini.
Pricing (as stated): Open source; free tier · Mature
17. Paperclip
Self-hosted app for running a team of AI agents like a small company, with org charts, goals, budgets and approval gates across Claude Code, Codex, OpenClaw and other harnesses.
Pricing (as stated): Open source · Mature
18. Claude-Mem
Gives coding agents memory across sessions by capturing what they do, compressing it and feeding the relevant context back in later.
Pricing (as stated): Open source · Mature
19. Agent-Reach
Lets an AI agent read and search sites like X, Reddit, YouTube and GitHub through one toolkit, without paid APIs.
Pricing (as stated): Open source · Mature
20. Orca
Agent development environment for running a fleet of parallel coding agents on your own subscriptions and reviewing their work.
Pricing (as stated): Open source · Mature
21. RAGFlow
Open-source RAG engine with deep document parsing and agent features for building grounded question-answering over your files.
Pricing (as stated): Open source + cloud · Mature
22. Zed
High-performance, multiplayer code editor from the creators of Atom and Tree-sitter, with built-in AI agent editing for macOS, Linux and Windows.
Pricing (as stated): Open source · Mature
23. MCP reference servers
Official collection of reference MCP servers.
Pricing (as stated): Open source · Mature
24. OpenHands
Open-source platform for autonomous coding agents.
Pricing (as stated): Open source + paid cloud · Mature
25. Scrapling
Python web-scraping framework with fast HTTP requests, stealth browsers, adaptive parsing and concurrent crawling, plus an MCP server for agents.
Pricing (as stated): Open source · Mature
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Related: Open-source agents by task · Self-hosted AI agents
Related searches: Open-source AI coding agents · AI coding agents for the terminal (CLI)
More best-of lists: All best lists · Best AI Coding Agents · Best AI Agent Frameworks · Best AI Browser Agents · Best Open-Source MCP Servers · Best Self-Hosted AI Agents · Best Free AI Agents (Free Plans) · Best No-Code AI Agent Builders · Best AI Voice Agent Platforms · Best AI Agent Observability & Eval Tools · Best Personal AI Agents · Best AI Agents for Business Teams · Best Crypto AI Agents
Facts come from our directory listings; pricing is as each maker states it and GitHub stars are as recorded on each listing. Check official sites before you choose.