What programs would anyone recommend learning, besides illustrator and photoshop, to get a job in digital art/design.

I am a traditional 2d artist that for a while did computer art but I am out of the loop again and taking a hiatus from school and am self learning Illustrator, I already have a large knowledge of Photoshop, but I want to know what else I should learn. Especially things that can be self-taught without being too complicated.