I really enjoy RethinkDB. Partly, that's cause it's the first time I've really dug into a nosql database, and I'm loving the freedom of it... Being able to dump stuff straight from a websockets feed straight into the database is awesome! Also, I like the web interface. It's simple and shows me what I want to see with regard to performance and storage.

I haven't really gotten much into doing fancy queries or transforms or streams.

If someone could make a tool that let you use RethinkDB as a (more or less) direct back end for pandas... That would be killer