Best Open-Source MCP Servers (2026)
Open-source MCP servers and MCP infrastructure you can run yourself and connect to Claude Code, Cursor, Codex and other MCP clients. Below are the top 25 of 117 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 |
|---|---|---|---|
 REA | Open source | Write code | Yes |
 MCP reference servers | Open source | Connect tools via MCP | Yes |
 Codebase Memory MCP | Open source | Write code | Yes |
 GitHub MCP Server | Open source | Write code | Yes |
 MCP for Blender | Open source | Connect tools via MCP | Yes |
 Serena | Open source | Write code | Yes |
 FastMCP | Open source | Build an agent | Yes |
 MCP Python SDK | Open source | Build an agent | Yes |
 n8n-MCP | Open source | Automate workflows | Yes |
 MCP Toolbox for Databases | Open source | Connect tools via MCP | Yes |
1. 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
2. MCP reference servers
Official collection of reference MCP servers.
Pricing (as stated): Open source · Mature
3. Codebase Memory MCP
MCP server that indexes codebases into a persistent knowledge graph so coding agents can look up structure quickly.
Pricing (as stated): Open source · Mature
4. GitHub MCP Server
GitHub's official MCP server for letting agents work with repositories, issues, pull requests and Actions.
Pricing (as stated): Open source · Mature
5. MCP for Blender
Community MCP plugin that lets Claude and other LLMs control Blender for prompt-driven 3D modeling, scene creation and manipulation.
Pricing (as stated): Open source · Mature
6. Serena
MCP toolkit that gives coding agents semantic code retrieval and editing, like IDE features.
Pricing (as stated): Open source · Mature
7. FastMCP
Pythonic framework for building MCP servers and clients quickly.
Pricing (as stated): Open source · Mature
8. MCP Python SDK
Official Python SDK for building Model Context Protocol servers and clients.
Pricing (as stated): Open source · Mature
9. n8n-MCP
MCP server that lets Claude, Cursor and other agents build n8n workflows for you.
Pricing (as stated): Open source · Mature
10. MCP Toolbox for Databases
Open-source MCP server from Google for connecting agents to databases.
Pricing (as stated): Open source · Mature
11. Framelink Figma MCP
MCP server that gives Cursor and other coding agents Figma layout data so they can implement designs accurately in one shot.
Pricing (as stated): Open source · Mature
12. MCP TypeScript SDK
Official TypeScript SDK for building MCP servers and clients.
Pricing (as stated): Open source · Mature
13. IDA Pro MCP
MCP server connecting IDA Pro to language models for AI-assisted reverse engineering.
Pricing (as stated): Open source · Mature
14. Apify MCP Server
Apify's MCP server giving agents access to thousands of scrapers for social media, search and maps.
Pricing (as stated): Open source + cloud · Mature
15. MCP Inspector
Official developer tool for testing and debugging MCP servers through a web UI, CLI or terminal UI.
Pricing (as stated): Open source · Mature
16. mcp-use
Full-stack MCP framework for building MCP servers, MCP apps and agents that connect to them.
Pricing (as stated): Open source · Mature
17. 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.
Pricing (as stated): Open source · Mature
18. AWS MCP Servers
Collection of official open-source MCP servers for working with AWS services from agents.
Pricing (as stated): Open source · Mature
19. GitMCP
Free remote MCP server that gives agents up-to-date docs and code for any GitHub project.
Pricing (as stated): Open source · Mature
20. OneUptime MCP
OneUptime's official MCP server, giving agents access to monitors, incidents, on-call and status pages in this open-source observability platform. Free plan, paid plans from $22 per user, or self-host.
Pricing (as stated): OneUptime free plan; paid plans from $22 per user/month; self-host free. · Mature
21. MCP Registry
Official community-driven registry service and API that lists Model Context Protocol servers for MCP clients, like an app store for servers.
Pricing (as stated): Free and open source (Apache-2.0, transitioning from MIT); public registry API free · Mature
22. BrowserTools MCP
MCP server that lets Cursor and other agents read browser console logs and network activity.
Pricing (as stated): Open source · Mature
23. Talk to Figma MCP
MCP integration that lets coding agents read and edit Figma designs.
Pricing (as stated): Open source · Mature
24. Klavis AI
MCP integration platform that lets agents use many tools reliably at scale.
Pricing (as stated): Open source + cloud · Mature
25. Wigolo
Local-first web search, fetch and crawl for coding agents over MCP, with no API keys.
Pricing (as stated): Open source · Mature
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Related: All MCP servers · Agent infra · for Claude Code · for Cursor · for Codex
Related searches: MCP servers for Figma, Canva and design tools · MCP servers for AWS, Azure, Cloudflare, Kubernetes and Vercel · Web search MCP servers for AI agents · Free MCP servers
More best-of lists: All best lists · Best AI Coding Agents · Best AI Agent Frameworks · Best AI Browser Agents · Most-Starred Open-Source AI Agent Projects · 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.