"How to obtain an API key" matching MCP connectors:

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.

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.

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

**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

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

Shared, verifiable memory for AI agents and robots: signed tokens that resolve and verify offline.

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

Hosted persistent memory for AI agents. No signup, no install—one MCP URL to remember & recall.

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

Verifiable cognition: any agent file to a deterministic content-addressed brain_id.

NVIDIA AI knowledge graphs — 20 domains. 4x F1, 11x fewer tokens, SHA-256 provenance. MCP-native.

Native Clarity decision mapping, MindScan episode reflection, and read-only evidence tools.

Manage portable AI agent playbooks, Agent Skills, MCP configurations, personas, and memory.

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

Free game-theory negotiation advisor for agents, plus paid receipted sessions and agent memory.

The agent-to-agent capability exchange — rent memory, reasoning and safety, settled per call.

Persistent memory for AI agents — log and recall conversation context over MCP.