The definitive community-curated registry of 100% free and open-source Model Context Protocol (MCP) servers. Built for AI engineers shipping with Claude Desktop, Cursor, LangGraph, LangChain, and CrewAI.
SaferSkills independently audited freemcp-registry (Agent Skill) and scored it 45/100 (orange). The audit ran 55 deterministic rules across Security, Supply Chain, Maintenance, Transparency, and Community; it found 1 high-severity and 0 lower-severity findings. The full rule-by-rule trace and per-finding evidence are below. Free, methodology-open.
Findings & checks · 1 flagged
A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.
*.sig, SIGNATURES) outside the documentation.Every scanned point with the score it earned and what moved between them.
First recorded scan — no prior version to compare against.
The primary manifest — the file an agent reads to learn what this artifact does.
<p align="center"> <img src="https://img.shields.io/badge/MCP-Registry-6366f1?style=for-the-badge&logo=data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJNMTIgMkwyIDdsOTkuOTk5IDUgMTAtNS0xMC01ek0yIDE3bDEwIDUgMTAtNUMyIDEybDEwIDUgMTAtNSIgc3Ryb2tlPSJ3aGl0ZSIgc3Ryb2tlLXdpZHRoPSIyIi8+PC9zdmc+" alt="FreeMCP Registry" /> <img src="https://img.shields.io/badge/100%25-Free%20%26%20Open%20Source-34d399?style=for-the-badge" alt="Free & Open Source" /> <img src="https://img.shields.io/badge/License-MIT-818cf8?style=for-the-badge" alt="MIT License" /> <img src="https://img.shields.io/badge/Infra%20Cost-%240%2Fmo-22d3ee?style=for-the-badge" alt="$0/mo" /> </p>
<h1 align="center">FreeMCP.in</h1>
<p align="center"> <strong>The community-curated registry of 100% free and open-source<br/>Model Context Protocol (MCP) servers.</strong> </p>
<p align="center"> <a href="https://freemcp.in">🌐 Live Site</a> · <a href="#-submit-a-server">📬 Submit a Server</a> · <a href="#-contributing">🤝 Contribute</a> · <a href="https://github.com/strbbrn/freemcp-registry/registry/discussions">💬 Discussions</a> </p>
The Model Context Protocol (MCP) is an open standard created by Anthropic that provides a universal way for AI models and agents to connect to external tools, data sources, and services. Think of it as a USB-C port for AI — one protocol, infinite possibilities.
MCP servers expose capabilities (tools, resources, prompts) that any compatible AI client — Claude Desktop, Cursor, LangChain, LangGraph, CrewAI — can instantly use without custom integration code.
FreeMCP.in exists because finding reliable, truly free MCP servers shouldn't require digging through scattered GitHub repos or hitting enterprise paywalls.
FreeMCP is a fast, searchable, static registry that curates only free and open-source MCP servers. No freemium traps. No enterprise tiers. No vendor lock-in.
| Problem | FreeMCP Solution |
|---|---|
| Existing directories mix paid and free tools | Strictly 100% free & open-source servers only |
| Hard to find servers by use case | Category filters + real-time search by name, tags, description |
| No standardized quality bar | Community-vetted with clear submission criteria |
| Registries require expensive backends | Zero-cost static site — JSON data + Cloudflare Pages |
| Discovery is fragmented across GitHub | One central hub for the community |
All server data lives in a single static JSON file:
src/data/registry.jsonEach entry follows this schema:
{
"id": "unique-server-id",
"name": "Server Display Name",
"description": "What this server does and why it's useful for agents.",
"githubUrl": "https://github.com/author/repo",
"author": "github-username",
"category": "Database | Development | Security | DevOps | Utilities | Search | Communication | Cloud",
"stars": 1234,
"tags": ["tag1", "tag2", "langchain", "devsecops"],
"featured": false
}| Category | Description | Examples |
|---|---|---|
| 🗄️ Database | SQL/NoSQL access for agents | SQLite, PostgreSQL |
| ⌨️ Development | Code, repos, and dev workflows | GitHub, Filesystem |
| 🛡️ Security | Scanning, SAST, recon, ASM | Shodan, Nmap, Semgrep |
| 🚀 DevOps | Containers, CI/CD, infra | Docker |
| 🔧 Utilities | General-purpose tools | Puppeteer, Browser automation |
| 🔍 Search | Web and data search | Brave Search |
| 💬 Communication | Messaging and notifications | Slack |
| ☁️ Cloud | Cloud provider integrations | AWS Knowledge Base |
Found a great open-source MCP server that's not listed? We'd love to add it!
Before submitting, make sure the server meets all of these:
Option A: GitHub Issue (easiest)
Option B: Pull Request (for contributors)
src/data/registry.jsonAdd: [Server Name]You submit → Maintainer reviews → Merged to main → Cloudflare auto-deploys → Live on freemcp.inTypical turnaround: 24–72 hours. We review every submission manually to maintain quality.
FreeMCP is built by the community, for the community. There are many ways to contribute beyond adding servers!
| Contribution | Description | Difficulty |
|---|---|---|
| 🆕 Submit a server | Add a new MCP server to the registry | Easy |
| 🐛 Report a bug | Found a broken link or UI issue? Open an issue | Easy |
| 📝 Improve descriptions | Help write clearer server descriptions | Easy |
| 🏷️ Suggest categories/tags | Help us organize better | Easy |
| 🎨 UI/UX improvements | Design tweaks, accessibility, mobile fixes | Medium |
| ⭐ Star the repo | Helps others discover FreeMCP | Easy |
| 📢 Spread the word | Share on Twitter/X, Reddit, Discord, HN | Easy |
| 🧪 Test servers | Verify listed servers still work | Medium |
| 🌐 Add features | Search improvements, new pages, PWA support | Advanced |
# Clone the repo
git clone https://github.com/strbbrn/freemcp-registry/registry.git
cd registry
# Install dependencies
npm install
# Start dev server
npm run dev
# Build for production
npm run build
# Preview production build
npm run previewfreemcp-registry/
├── src/
│ ├── data/
│ │ └── registry.json # ← The registry database (edit this to add servers)
│ ├── layouts/
│ │ └── Layout.astro # Global layout, nav, footer, design system
│ └── pages/
│ └── index.astro # Main page — hero, search, card grid
├── astro.config.mjs # Astro configuration
├── tailwind.config.mjs # Tailwind CSS configuration
├── wrangler.toml # Cloudflare Pages deployment config
└── package.jsonnpm run build before submitting a PR| Layer | Technology | Why |
|---|---|---|
| Framework | Astro | Zero-JS by default, blazing fast static builds |
| Styling | Tailwind CSS + custom CSS | Utility-first with design token system |
| Fonts | Inter + JetBrains Mono | Premium readability for UI + code |
| Data | Static JSON | No database, no API, no cost |
| Hosting | Cloudflare Pages | Free tier, global CDN, automatic deploys |
| Domain | freemcp.in | Custom domain |
Total infrastructure cost: $0/month (forever on the free tier)
We're just getting started. Here's what's planned:
claude_desktop_config.json snippetsHave an idea? Start a discussion →
FreeMCP is a zero-budget, community-driven project. The best way to help is to spread the word:
Every star, share, and contribution helps more AI engineers discover free tools. Let's build the definitive open-source MCP ecosystem together.
This project is licensed under the MIT License — see the LICENSE file for details.
You're free to use, modify, and distribute this project. Attribution is appreciated but not required.
<p align="center"> <strong>Built with ❤️ for the AI engineering community</strong> <br/> <a href="https://freemcp.in">freemcp.in</a> </p>
~30 seconds. Free. No account. Every finding cites a rule and a line of evidence.