"Open Collective" matching MCP connectors:

Federated search of books and papers, BibTeX/RIS citations, open-access retrieval and reading.

Measured share of answer for 24 crypto and Web3 brands. An open dataset, not an audit of your site.

Measured share of answer for 20 SaaS brands. An open dataset, not an audit of your site.

Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Open AI Visibility Index for SaaS and AI tools. Weekly share-of-answer measurements for 20 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Official MCP: continuous supply-chain risk monitoring and early warning, not a one-off report. Register and create a key at https://supplygraph.ai/zk_chat_os/dashboard/dashboard.html — if you are not signed in you will be redirected to login; new users can register there. After login, open A2A / MCP and click Create Production Key or Create Sandbox Key. Send the header as Bearer <api_key> (one Bearer prefix, then the raw key). Optional for initialize and tools/list; required for tools/call.

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

Catch AI-fabricated citations (real DOI + fake title). Retraction, open-access, 10,000+ CSL styles.

Official data with free samples, provenance, aggregations, freshness and agent-ready insights.

eLife MCP — keyless open-access life-sciences & biomedical journal articles.

Open Beauty Facts MCP — Open Beauty Facts API (free, no auth, keyless).

EPO Open Patent Services MCP

Unpaywall MCP — open-access lookup for scholarly papers (free, no key)

UK NIHR (National Institute for Health and Care Research) open-data MCP.

OpenCitations COCI — open-license citation index by DOI

Crystallography Open Database (COD) MCP.

Read-only AI project discovery, verification, comparison, shortlisting, and stack planning.

Trivia MCP — wraps Open Trivia Database (free, no auth)

DOAJ MCP — Directory of Open Access Journals

Social Signal — post-VOLUME TIME SERIES across the open social networks that