"Web search services that don't require an API key" matching MCP connectors:

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

Loads your personal writing voice into any AI and scores how closely a draft matches it.

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

Turn AI chats into vocabulary: capture words and grammar into spaced-repetition flashcards.

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

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.

Persistent personal memory for AI assistants — save, search, and recall across every MCP client.

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.

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

Give your agent web search and authoritative datasets: S&P Global, FRED, OECD, SimilarWeb & more.

Trend, stats & insight search across PSFK expert graphs with citable sources.

Brand health & trend footprint across PSFK expert graphs with citable sources, not web summaries.

**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

Search harness engineering, agentic AI patterns, architectures, governance and agent taxonomy.

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

Read-only Wheel of Heaven corpus: myth search, primary texts, datasets, typed graph. CC0.

Cross-session, cross-device memory for your agent: remember and recall notes. No key to start.

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

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