Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Unity - The multiplatform game creation tools for everyone.
Repetier - Software for controlling RepRap style 3D-printer like Mendel, Darwin or Prusa mendel.
Godot Engine - Feature-packed 2D and 3D open source game engine.
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.