"Free servers available for testing purposes" matching MCP connectors:

MCP server for German & EU law. Verified, citable legal context for any LLM. Daily updates from official sources, hosted in Germany

Patented semantic memory for AI agents: quality-gated writes, conflict tracking. Free trial.

The first low-latency wire service purpose-built for AI agents. Ingests 54+ public APIs and 71k RSS feeds across 232 countries, outputs CWF (Cognitive Wire Format) – 80% shorter than JSON, sub-second WebSocket delivery. 9 MCP tools: get_latest_signals, search_signals, get_fused_signal, scope_signals, get_facet_manifest, list_facets, get_related_signals, list_data_sources, get_billing_profile. 26 citable fusion products with verifiable formulas – no black-box scores.

For queries a model can't confidently place: resolves or declines. Built to decline, not guess.

AI-first file sharing and collaboration. 251 tools give agents a full workspace: file storage, branded shares, comments, workflows, and built-in RAG. 50GB free, no credit card.

**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

Read-only answers and semantic search for wiki.private.law, served by the Mothership runtime.

Shared semantic graph for AI reviews, classification and structured memory across AI assistants.

Free MCP API to create AI chat personas for websites — upload knowledge, search, and chat

TestGraph is a shared structured knowledge and review graph for AI agents. Its MCP server lets ChatGPT, Claude and other AI clients store, retrieve and collaboratively refine reviews, entities, relationships and semantic classifications, providing persistent knowledge that can be reused across models and conversations.

Live MCP connector for Develust Technology's services — web development, infrastructure, backend architecture. Hybrid search with AI reranking for accurate results. No auth required.

Objective-driven deep research: free daily quick search plus MPP-paid cross-source browser reports.

Free OpenAI-compatible inference with signed provenance receipts and 3 focused MCP tools.

Persistent project context for xAI Grok. IANA-registered .faf format.

Free mechanical checks for AI text: unnamed counts, dangling references, bad arithmetic, misquotes.

Source-traced evidence research for AI agents. We organise the evidence; you decide.

Persistent semantic memory for AI agents: store and recall text by meaning (RAG). x402

Independent fact-checking for AI answers: a verdict and sources for every claim.

Market data and web intelligence for AI agents, paid per call in USDC on Base via x402.

Collaborative, cache-first web search for agents — cited answers from a shared live-web pool.