Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
IceSL - Welcome to IceSL!
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Repetier - Software for controlling RepRap style 3D-printer like Mendel, Darwin or Prusa mendel.
Printrun - Printrun is a full suite of host interfaces for 3D printers and CNC.