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MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
FreeCAD - An open-source parametric 3D modeler
Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
SketchUp - 3D for Everyone