The openNURBS Initiative provides CAD, CAM, CAE, and computer graphics software developers the tools to accurately transfer 3-D geometry between applications.

The tools provided by openNURBS include:

• Rhino's 3DM file format specification and documentation.
  
• C++ source code libraries to read and write the 3DM file format. The current Microsoft, Apple and Gnu compilers for Windows, Windows x64, Mac, and Linux are supported..
• .NET source code to read and write the 3DM file format.
  
• Quality assurance and revision control.
  
• Various supporting libraries and utilities.
  
• Technical support.

Unlike other open development initiatives, alliances, or consortia:

• Commercial use is encouraged.
  
• The tools, support, and membership are free.
  
• There are no restrictions. Neither copyright nor copyleft restrictions apply.
  
• No contribution of effort or technology is required from the members, although it is encouraged.

Note: openNURBS is an open source toolkit for reading and writing models in the 3DM format. Our full-featured development platform is Rhino.