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

Social Signal — post-VOLUME TIME SERIES across the open social networks that

SubDownload exposes YouTube as an MCP-native data source. Connect via OAuth and your AI agent can summarize videos, fetch full transcripts (even for videos with no captions, via AI ASR), search across channels, and save everything into a private knowledge base. Works with Claude, ChatGPT, Cursor, and 40+ MCP clients. Free credits on signup, no card required.

Bulk Bluesky profiles plus full follower/following exports via the open AT Protocol. Pay per record.