OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Lurssen Mastering Console - Digital audio mastering powered by years of pro-quality mastering experience.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Matchering - Open-source audio mastering app that masters music based on any reference track you provide.
FreeCAD - An open-source parametric 3D modeler
eMastered - eMastered makes a song sound better through online mastering.