"Apache Solr" matching MCP connectors:

Authenticated async GPT-5.6-sol Agent agent with status polling and artifact results.

Trust + receipt layer for x402 agents on Solana: free preflight + paid signed V6 trust receipt.

Free solar & home energy tools: estimates, incentives by ZIP, scores, cited guides, routing.

PLOS journals — Solr-backed full-text search across all PLOS OA content

The first artist-owned MCP server. Discover, narrate, and stream Matthew Hartley's debut album The Time Is Now from any compatible AI client. Exposes 8 tools (list_songs, get_song, list_chapters, get_chapter, get_artist, get_experience, get_experience_prompt, refresh_stream_urls) over a public HTTP endpoint with no auth. Apache 2.0 licensed.