SpeedTree - SpeedTree is a powerful toolkit used to create 3D vegetation for video games, films, and animations.
Saint Paint Studio - Saint Paint - The Essential Image Editor
Tree Studio - Easy 2D Tree Creation
AliveColors - AliveColors is comprehensive graphics and photo editing software for Windows and Mac.
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.
Sagelight - Sagelight is a comprehensive editing platform that allows adding multiple features to the images by improving, retouching, modifying the selective pics with high-quality work.