Free MCP servers (2026)
Model Context Protocol servers you can use for free, connecting Claude, Cursor, Codex and other MCP clients to your tools and data. Here are the top 25 of 144 from the AgentScout directory.
How we picked and ranked: tools are matched by category, the pricing each maker states and what each tool says it does. They are ranked by GitHub stars as recorded on each listing (link checks 2026-10-18); tools without a tracked repo follow, by listing maturity. No paid placements.
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. Mem0
Memory layer for AI agents.
Pricing (as stated): Open source + paid cloud · Mature
4. Context7
MCP server and platform that feeds coding agents up-to-date, version-specific library documentation.
Pricing (as stated): Freemium · Mature
5. Hindsight
Agent memory system that stores experiences and learns from them so agents improve over time.
Pricing (as stated): Open source + cloud · Mature
6. LocalAI
Self-hosted engine with an OpenAI-compatible API for running LLM, vision, voice and image models on your own hardware, including agents.
Pricing (as stated): Open source · Mature
7. 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
8. 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
9. Cognee
Open-source memory platform that builds knowledge graphs so agents keep long-term memory.
Pricing (as stated): Open source + cloud · Mature
10. Graphiti
Builds real-time, temporal knowledge graphs that serve as memory for AI agents.
Pricing (as stated): Open source · Mature
11. Google Workspace CLI
Official Google Workspace command-line tool for Drive, Gmail, Calendar, Docs and more, usable by agents.
Pricing (as stated): Open source · Mature
12. Serena
MCP toolkit that gives coding agents semantic code retrieval and editing, like IDE features.
Pricing (as stated): Open source · Mature
13. Chroma
Open-source search and vector database widely used for agent memory and RAG.
Pricing (as stated): Open source + cloud · Mature
14. TencentDB-Agent-Memory
Team-level memory hub that turns conversations, docs and code into shared memory for agents.
Pricing (as stated): Open source · Mature
15. FastMCP
Pythonic framework for building MCP servers and clients quickly.
Pricing (as stated): Open source · Mature
16. MCP Python SDK
Official Python SDK for building Model Context Protocol servers and clients.
Pricing (as stated): Open source · Mature
17. n8n-MCP
MCP server that lets Claude, Cursor and other agents build n8n workflows for you.
Pricing (as stated): Open source · Mature
18. MCP Toolbox for Databases
Open-source MCP server from Google for connecting agents to databases.
Pricing (as stated): Open source · Mature
19. NVIDIA OpenShell
Sandboxed runtime for autonomous agents with declarative YAML policies on file, network and credential access.
Pricing (as stated): Open source (Apache 2.0) · Active; part of newly announced Open Agent Safety Platform
20. OpenSandbox
Secure, fast sandbox runtime for AI agents to run code.
Pricing (as stated): Open source · Mature
21. Corsair
Integration layer for connecting your users' apps to agents.
Pricing (as stated): Open source · Mature
22. Casdoor
Agent-first identity and access management with an MCP and agent gateway.
Pricing (as stated): Open source · Mature
23. MCP TypeScript SDK
Official TypeScript SDK for building MCP servers and clients.
Pricing (as stated): Open source · Mature
24. EverOS
Local-first, portable memory layer for AI agents stored as Markdown.
Pricing (as stated): Open source · Mature
25. CubeSandbox
Lightweight, concurrent sandbox for running AI agent code securely.
Pricing (as stated): Open source · Mature
FAQ
What are the best free MCP servers?
Ranked by tracked GitHub stars, the top free MCP servers in our directory are REA, MCP reference servers, Mem0, Context7, Hindsight. Stars measure popularity, not fit, so compare a few against your own task.
How many free MCP servers does AgentScout list?
144 tools match. This page shows the top 25. Pricing mix on this page: Open source (20), Open source + cloud (4), Freemium (1).
Are these tools really free?
Pricing is what each maker states on their site. Open-source tools are free to self-host but may need a paid model API key or offer paid cloud plans; freemium tools have a free plan with limits. Check each official site.
Where can I see every tool for connecting tools with MCP?
Our task page lists all 199 tools we match to connecting tools with MCP.
Related: All tools for connecting tools with MCP · Best Open-Source MCP Servers · MCP & infra (144)
By role: For developers · For AI engineers
All popular searches · AI agents by role · Free tools
Facts come from our directory listings; pricing is as each maker states it and can change. Check official sites before you choose.