Blender: Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License. It is a powerful program, containing features that are characteristic of high-end 3D software.
Google Sketchup: Google SketchUp is fun and free, and is known for being easy to use. To build models in SketchUp, you draw edges and faces using a few simple tools that you can learn in a short time. With with Push/Pull tool you can extrude any flat surface into a 3D form.
TinkerCAD: TinkerCAD is a browser-based CAD tool that uses WebGL. This tool provides a new and faster way of creating designs for your 3D printer. With only three basic tools you can create a wide range of useful things. Once your project is ready simply download the STL file and start your 3D print.
OpenSCAD: Known as the programmers solid 3D CAD modeller, OpenSCAD uses a different approach to building 3D objects. OpenSCAD is not an interactive modeller. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters.
netfabb Basic: netfabb Basic is a freeware application for working with STL files. The freeware version includes Advanced Model Browsing, STL Fixing and Part Analysis, Measurement and Quality Management.
Meshlab: MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. The system is aimed to help the processing of the typical not-so-small unstructured models arising in 3D scanning, providing a set of tools for editing, cleaning, healing, inspecting, rendering and converting this kind of meshes.
MeshMixer: MeshMixer is a free tool from Autodesk for 3D mashups and remixes. Mash, mix, sculpt, stamp or paint your own 3D designs, or start from over 10,000 models in the Gallery. Now includes direct 3D print support.
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