Open Brush is the community led successor to Tilt Brush!
3D PBR Texture Painting Software
3D Engine with Blender Integration
cellPAINT allows users to create living illustrations of biology.
Deep paint and stop-motion animation software
Free yourself
Look at the painting and guess the artist
PaintBox is a free open source painting program with built in shapes.
jchart2d is a real-time charting library written in java.
An Interactive Source Separation Editor
An open-source cross-platform digital painting / image editing app
simple algorithm for a realtime interactive visual cortex for painting
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor