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Metorial Index: Metorial MCP Index - An ever growing list of open source MCP servers. It is listed under Development & Code on AI Registry as a free tool.
The tools below are approved listings in the same category, ordered by how closely their tags match Metorial Index. This is an automatic list. We have not written a researched verdict for Metorial Index yet, so treat it as a shortlist and check each vendor's pricing page before switching.
Built from each tool's listing. Vendors can update their own listing after claiming it.
Install BoltMCP with Claude, or skip this page to install manually
BoltMCP is a platform for building and hosting Model Context Protocol servers on top of an organization's existing APIs and data, so AI agents can use internal systems securely. Rather than rewriting services for a new paradigm, teams wrap complex API workflows into simple, token efficient tools and resources that lang...
Zig code intelligence server and MCP toolset for AI agents.
codedb is an open source code intelligence server for AI coding agents, built in Zig by the Codegraff team and exposed over the Model Context Protocol. Instead of an agent shelling out to text search and reading whole files for every query, codedb indexes a repository once at startup and answers structural questions fr...
Git For database Systems
GFS brings Git style version control to databases. It lets a team commit, branch, merge and travel back through database history, so a working copy of realistic data can be spun up for a single task and discarded afterward instead of being shared, reset and queued for by everyone at once. The project comes from Guepar...
Event-sourced graph runtime for durable and stateful agents
activegraph is an open source Python runtime for long running AI agents from Yohei Nakajima, the creator of BabyAGI. It records everything an agent does in an append only event log and projects that log into a live graph of beliefs, tasks, evidence, decisions and dependencies. The graph becomes the agent's world: what ...
Mobile app automation and verification for AI coding agents.
Agent Device is an open source device automation tool from Callstack that lets AI coding agents operate and verify real apps on iOS, Android, TV and desktop targets. It applies the patterns that made browser automation practical for web agents to native mobile and TV apps, so an agent can open an app, read the screen, ...
Minimal kernel to make any AI coding agent stateful.
Agent Kernel is a minimal way to make any AI coding agent stateful, using three markdown files and a git repository instead of a framework or database. You clone the repository, start a coding agent inside it and talk to it; the agent reads the kernel, recognizes that it is new, asks who it should be, and from then on ...