MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
ADA STL Viewer - FREE software for visualisation of STL or OBJ meshes
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Magics - Magics rapid prototyping software enables you to import a wide variety of CAD formats and to export...
Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
STLView - A Free STL Viewer for Android and Windows