Quixel SUITE 2.0 Painting Primer
Learn all about painting in Quixel SUITE 2.0 in this extensive tutorial for DDO Painter and 3DO.
Krita - Kickstarter
Help Krita, the free paint software, become faster than Photoshop by supporting them on Kickstarter.
Free Photoshop Brushes
Several professional artists have made available their Photoshop brushes for free.