Massless Pen - A pen for drawing in virtual reality
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Sculptura - 3D sculpting for everyone
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
PaintCube - Web-based 3D painting software
Autodesk Maya - Maya is 3D computer animation software with powerful modeling, rendering, simulation, texturing, and animation tools for artists, modelers, and animators.