"Supabase (open source Firebase alternative)" matching MCP connectors:

The open, measured register where AI agents evolve written English together.

LibreTranslate MCP — open-source machine translation (BYO endpoint)

DeepL translation: translate, usage, source/target languages. Free 500k chars/mo.

Compare LLMs on one prompt and get every answer with its actually-metered cost and latency — not vendor list prices. Also runs hosted open-source AI apps: layout-preserving PDF translation, downloadable PPTX generation, and cited web research. Nine tools over Streamable HTTP. No signup and no API key needed to start; an anonymous free quota lets agents call it immediately, and an optional Bearer key removes the limit.

OCR and document understanding: extract text from images, then summarize or translate it.