As with others here, various JetBrains tools and Linux-compatible Steam games (I have 75 and counting). Also a file comparison tool called Beyond Compare.

If Adobe released their apps on Linux (more specifically Photoshop and Premiere) I'd buy them in a heartbeat. Unfortunately they seem more interested in supporting the iPad if recent news is to be believed.

Edit: Just remembered I have a Sublime Text license too, although I stopped using it a while ago.