Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Mastercam - Mastercam's Dynamic Milling is a game changer for us.
FreeCAD - An open-source parametric 3D modeler
CamBam - CamBam CNC software, best value for money, feature rich, CNC Software for G-Code generation on CNC Routers, CNC Mills, Homemade CNC machines, for 2D pocketing, 2D profiling, Text Engraving, Photo Engraving and 3D carving.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Carveco - Carveco™ software is the trusted CAD modelling and CNC machining solution to a wide vatiety of industries worldwide.