Elixir and, increasingly, Rust.

These days, two languages (Ruby, which is my favorite language and the main one I’ve worked in lately, and Elixir, which I’m slowly learning) and two frameworks (I’ll give you three guesses). I also try to keep a good eye on general industry news, like what new languages, frameworks, methodologies, concepts, etc. come into existence.

There is currently nothing else I deliberately keep an eye on less regularly. However, I will pay a bit more attention to things I stumble across in Python (second choice of the languages I have used for work) or vanilla JavaScript (which I don’t like, and haven’t used all that much or intensively, but have to do once in a while).

I kind of only follow Swift.