Most of my current work is in JavaScript, but that's simply because I'm working on a web app that happens to not need any back-end (it literally never touches the server once it's loaded). In terms of sheer work done, Python is my main language though (with Lua probably being a close third at this point after Python and JS).

As far as languages I'd like to learn, probably either Go or Rust, although neither is likely to happen soon (too busy with the aforementioned web app and learning to speak Swedish). I find the combination of performance and versatility offered by both to be rather attractive, and they both seem to be picking up steam as languages of choice for new FOSS projects.