Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
Placeit - Generate realistic product shots in seconds
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Smartmockups - Create stunning product mockups, easily and online.
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.