"Supabase (open source Firebase alternative)" matching MCP connectors:

Open scientific and engineering knowledge for AI agents: search, evidence, document publishing.

Push Realm is an MCP server and AI agent knowledge network where agents search proven fixes, publish what worked, and turn dead ends into open problems other agents can close. Compare how agents and tools perform in different topic areas.

Canonical vocabulary server for autonomous business design. Exposes the Arco Lexicon as seven MCP tools: term lookup, related terms, alignment verification, citation formatting, source retrieval, term listing, and term suggestion. No authentication required. Streamable HTTP transport.

Free, open MCP server for The Urantia Papers. 197 papers, 14,500+ paragraphs, 4,400+ entities.

**ColdState Knowledge Search MCP Server** https://github.com/daniel-coldstate/coldstate-mcp Semantic search over 64.6M knowledge entries — the structured alternative to web search APIs and web scraping for LLM agents. No crawling, no rate limits, sub-3s responses. Cloud-hosted at services.coldstate.ai

Open Targets MCP — disease/target/drug knowledge graph.

OpenCitations COCI — open-license citation index by DOI

ConceptNet MCP — open multilingual word/phrase relation graph

Norwegian open-source community wiki (2,290 articles, 2008-2022) as a signed KCP knowledge web.

Variable relationships from research papers with causal direction and source traceback.

A multi-domain reference corpus where every answer drills down to its cited, verified source.

Disease Twin — Brazil's rare-disease knowledge graph (10,468) over MCP. Source-grounded, PT-BR.

Real engineering memory marketplace for autonomous AI agents. Query structured lessons (problem → root cause → solution + confidence 80-100%) extracted from real GitHub/Slack incidents. Categories: debugging, architecture, performance, security, infrastructure & more.

aX is an agent-native collaboration network. A single Streamable HTTP MCP endpoint gives agents persistent identity, real-time messaging with @mentions and threads, tasks and handoffs, shared workspace context, semantic search, agent discovery, and rendered MCP App / widget artifacts that humans and agents can open and play back.

Give your agents trusted access to a company's living documentation. Search, read, and update source-of-truth knowledge across engineering docs, runbooks, decisions, code context, and team knowledge. `https://falconer.com/mcp

Liminality takes a hard question, a decision, or a multi-step task and breaks it into its real sub-questions, ties each to a real tool or source, and returns a worked, reusable result: a scored decision frame for a choice, or a grounded synthesized answer. It is built for hard, multi-step, and decision work rather than quick lookups, and its shared library of solved routes makes repeat work cheaper.

Open-source all-in-one MCP-first customer platform: KB, Conversations, CRM, CMS, Outreach, Analytics

AIMEAT - the Linux of AI. An open, federated, self-hosted AI operating system you own. MIT.

An agent-first commons: merit crowns each domain's open model; standing is earned, never bought.

Search source collections your team vetted. Every passage cites its URL and fetch date.