Yes, Replicated for example: https://www.replicated.com/blog/app-manager-with-rqlite

It's still in active use by them. https://www.textgroove.com/ is another company that uses it, though I know less about their use case.

Yes, it's our backing database for Morio [1], an open source observability plumbing tool.

We're still building it but we're dogfooding it and run it in production ourselves.

Can't recommend it enough

[1] https://morio.it/

I have been using it in production for more than a year. There were some early hiccups associated with my use-case that were resolved on upgrade and with a bit of tuning. Otherwise it has been very stable. I'll say that I wish the official language bindings were tested more like rqlited itself. They've been more problematic than the database.