"Free tools or resources that do not require an API" matching MCP connectors:

Hosted MCP memory: save sessions/decisions once, search from Claude, Cursor, ChatGPT. EU-hosted FTS.

Persistent memory layer that saves and recalls your project context and preferences.

Google Keep-style notes app with an MCP server for AI agents to read/write notes.

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.

Shared long-term memory vault for AI agents with 20 MCP tools.

Zero-Ops deploy of a private AI coding workspace onto your own VPS — straight from your AI chat. Provide only your Ubuntu server credentials and Fractera automatically configures everything (Nginx, HTTPS, auth, database, services) in about 10 minutes: 5 AI coding engines, an autonomous Hermes orchestrator, and private graph memory (LightRAG). No terminal, no DevOps. IP-first and free; a custom domain with HTTPS is an optional later step.

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.

Durable, versioned memory for AI assistants. Remote memory needs a Pastepile subscription.

**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

Check claims against a fact-store: consistent, contradicts, or unverifiable — with a receipt.

Wikipedia, Wikidata and Wiktionary as clean JSON, not HTML. 1.9M searchable. Free, no auth.

Author rules from policy docs, then decide: a Rete engine gives the verdict, an LLM explains why.

Create your digital twin: a public page that answers from your own material, with citations.

Persistent memory for AI agents. Semantic recall by meaning, not just keywords. No signup needed.

Community-maintained knowledge base for Radix DLT — search, read, and contribute wiki pages.

Wikidata MCP — wraps Wikidata API (wikidata.org/w/api.php)

GRIN-scored news for agents: discover by verdict, pull full analysis, traverse extraction graphs.

Shared, versioned context that humans and AI agents can publish, review, annotate, and continue.

FastMCP server for TheBrain API — AI access to a personal knowledge graph, Tollbooth-monetized