Basically visual arts software and some writing software. Additionally I have a free version of Ableton Live Lite 11 (so one music-making application as well) that came with my keyboard.

I mostly do photography, writing, and other visual arts type work on my two computers. I use quite a few photography and painting applications (Photoshop, ArtRage, Rebelle, Lightroom, Inspirit, and a few others; I’m also looking at BlackInk), as well as Scrivener and MS Office when I’m writing. I don’t know if any of those run well or at all in Linux or in Wine, etc. Also I stopped flirting with learning programming and there wasn’t much point maintaining a Linux machine after that. I think Linux is better than Windows all around, and I hate Windows, but it’s just because I use certain apps and from what I’ve heard and seen the Linux apps just aren’t as good.

TLDR, creative software that won’t run on Linux (to my knowledge, anyway).