Glimpse is the new GIMP.
Pixel artist waneella.
Red Giant has made their Complete collection free for students and teachers.
A 3D-printable mask. I don't how how great it is really. More washable, or at least more washable quickly.
Here's a mask head harness, which is less annoying to the ears. You can print on PLA but you need to bend it while it's warm. I think you can warm it with hot water too.