Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Lurssen Mastering Console - Digital audio mastering powered by years of pro-quality mastering experience.
FreeCAD - An open-source parametric 3D modeler
Matchering - Open-source audio mastering app that masters music based on any reference track you provide.
Sculptris - Sculptris: Enter a world of digital art without barriers.
eMastered - eMastered makes a song sound better through online mastering.