Any favorite MCP tools?

I'm fascinated by the ability to extend what Cursor can do with MCP features but there are so many out there, with some of questionable pedigree, that I'm having a hard time finding the gems.

I've tried a few but so far I've only gotten good usage from the Think tool which allows Cursor to basically jot down notes on it's process which it can then refer to later. Theoretically allowing more context than just the context window https://github.com/DannyMac180/mcp-think-tool Since I've installed it Cursor seems to use it a lot but it's hard to gauge how much it helps in practice. I'm glad the AI likes it though :)

Are there any must have MCP tools that you found have improved your workflow?