What's your favorite Productivity app for Linux?

I'm personally a big fan of Joplin. Even though it's something I tend to go for periods without using, I always come back to it and remember why I started keeping notes with it in the first place: it's a great way to keep my to do lists and thoughts organized, it can be backed up and sync'd easily, it can export to a number of formats, and it's very intuitive (if you're using the desktop app rather than the terminal based one, it has a lovely interface which is Markdown compatible).

#linux