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
OctoPrint - OctoPrint is the snappy web interface for your 3D printer that allows you to control and monitor all aspects of your printer and print jobs, right from your browser.
Repetier - Software for controlling RepRap style 3D-printer like Mendel, Darwin or Prusa mendel.
FreeCAD - An open-source parametric 3D modeler
Netfabb - Innovative software solutions for 3D printing and additive manufacturing.