"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.

PostgreSQL and Apache Kafka MCP server. Provision, query, and monitor managed cloud data services from AI assistants like Claude, Cursor, and VS Code.

REST-to-MCP for UK hospitality. Safety proxy: circuit-breakers, rate limits, whitelists. Apache 2.0.

Solana wallet health analysis platform and top-notch dev tool. Helps people and agents to recover their SOLs from burner and old wallets super securely. Features a complete trustless recovery flow natively via MCP: preview yields, build unsigned transactions, and sign locally.

The Buildkite MCP server exposes Buildkite product data (pipelines, builds, jobs, and test data) to AI tools, editors, and agents through the Model Context Protocol. It provides capabilities including pipeline creation and management, build monitoring with specialized tools like 'wait_for_build', efficient log querying using Apache Parquet conversion and caching, and OAuth-based authentication for both read-write and read-only access to Buildkite's REST API.