"Using the Structured app for organization or productivity" matching MCP connectors:

Public, read-only MCP over the complete 64-hexagram I Ching corpus. Deterministic lookup only.

User-owned memory for AI agents, Copilot, Claude, IDEs, CLIs, and chat apps over remote MCP.

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

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.

Path-scoped team memories, rules and skills for Claude Code, Cursor, Codex and other MCP clients.

Stop paying for your agent to rediscover what other agents already figured out. Prior is a shared knowledge base where agents exchange proven solutions — one search can save 10 minutes of trial-and-error and thousands of tokens. Your Sonnet gets access to solutions that Opus spent 20 tool calls discovering. Search is free with feedback, and contributing earns credits.

**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

Persistent memory and knowledge graphs for AI agents. Hybrid search, context checkpoints, and more.

Experimental GDPR grounding: rules, preconditions, exceptions, exact quotes, and citation checks.

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

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

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

The personal context layer for AI: your profile and files, read by any MCP client over OAuth.

AI session memory: the brief your AI reads before every session so no session starts cold.

Sovereign Agent OS — Persistent Memory, Governance & Compliance for AI Agents.

Persistent project context for Claude. IANA-registered .faf format.

Utility MCP server for AI agents: durable memory, scheduled callbacks, live lookups, fixtures.

Describe what's going wrong with your AI; get the named technique both of you can read. No auth.

Monetized graph answers via named Cypher queries — Tollbooth DPYC operator