My main work is music right now (yes, this is actually profitable for me) and the side stuff is software/games development. I do have a couple of free products and educational materials out, but this year I'm hoping I can swap the music to side-game status and have the game development become my main focus.
I'm not exactly a one person team, but I'm still the only programmer at my disposal (fancy that) and creating all the other content is a pain in the ass. There is still the potential to collect a few stacks teaching, though