Open Brush is the community led successor to Tilt Brush!
Curve Ensemble, a tool to manage and create curves
Deep paint and stop-motion animation software
Apodio - Gnu/linux Os for Artists & More
High-performance framework closest to native APP experience
AlphaCentauri is a completely free Office tools application.
Standalone software for photo editing and digital painting.
Development has moved to github
Painting Program
Gimp editor integrated in Google Chrome