Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Microsoft 3D Builder - View, capture, personalize, and print 3D models.
Repetier - Software for controlling RepRap style 3D-printer like Mendel, Darwin or Prusa mendel.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Padlet - Visual boards for organizing anything.