Unity - The multiplatform game creation tools for everyone.
Netfabb - Innovative software solutions for 3D printing and additive manufacturing.
Godot Engine - Feature-packed 2D and 3D open source game engine.
ADA STL Viewer - FREE software for visualisation of STL or OBJ meshes
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Free View Expert - Entry level tool targeted for viewing, verifying, dimensioning and communicating 3D geometry...