"An open-source relational database management system" matching MCP connectors:

Search domain availability and pricing, straight from chat, then open a link to register.

Structured habitat data and advisory tools for aquariums, marine tanks, terrariums and paludariums.

AI title risk analysis for Florida real estate closing docs. Get an API key at curagent.io

Closed-source remote MCP: model benchmarks, costs, HN signals, tech registry.

Eligibility-first UK & EU grant discovery, inside ChatGPT and Claude. Checks eligibility before recommending, explains why each grant fits, and cites the funder's own page on every answer — with an honest "competition_risk: unknown" when the data isn't there. 6 tools: search, fetch, find_opportunities, should_apply, explain_opportunity, complete_profile. Transport: Streamable HTTP. Auth: OAuth 2.1 + PKCE. Free to install, no card required.

Secureship MCP gives AI assistants access to a multi-carrier shipping API covering rate comparison, label generation, package tracking, pickup scheduling, address book management, shipment history, customs documents, and more — across carriers like UPS, FedEx, Purolator, Canpar, and others. Browse 150+ live endpoint schemas, parameters, and auth details — always current, never stale.

An instrumented editing loop for AI drafts: ai_tell_scan scores how human a draft reads with quoted evidence, burstiness_report maps sentence rhythm, voice_fingerprint profiles a real person's writing numerically, and the premium humanize_plan / verify_rewrite pair produces a rewrite brief and proves the result moved toward the target voice.

A skeptical senior-engineer code reviewer over MCP: risk-scans unified diffs, flags AI-generated-code tells, reports complexity hotspots, scans for leaked secrets, and runs an OWASP security pass — real analyzers, no external APIs. Free tier, no signup.

Search foods, compare nutrients, and look up the full USDA FoodData Central database.

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

An MCP server that provides tools to discover and retrieve podcast episodes transcripts.

Serve a folder of Markdown notes as an MCP server: hybrid search, reading, and sourced answers.

Find EV charging stations, detail, and reliability check-ins via the global Open Charge Map.

Consumer hotel search, live rates, booking, order management, and payment via TourMind.

EU AI Act Art-14 runtime oversight: allow / flag / gate-to-human on an agent action, with receipt.

Source-verified pet food regulations, recalls, nutrient standards and species care data.

Search 14.5M Smithsonian Open Access objects, get CC0 images, find cross-collection connections.

MET Museum collection via MCP — 500K+ artworks, metadata, provenance, open-access images.

Global weather via Open-Meteo: forecast, ERA5 archive, marine, air quality, geocoding, elevation.

Search and query government open-data portals (Socrata SODA API).