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SpeedTree - SpeedTree is a powerful toolkit used to create 3D vegetation for video games, films, and animations.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
The Grove 3D - Model or grow adaptive 3D Tree models for use in CG renderings.
Clip Studio Paint - The artist's software for drawing and painting.
Arbaro - Arbaro is an implementation of the tree generating algorithm described in Jason Weber & Joseph...
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.