
Open Design Alliance is a nonprofit organization creating software development kits (SDKs) for engineering applications. ODA offers interoperability tools for CAD, BIM, and Mechanical industries including .dwg, .dxf, .dgn, Autodesk Revit, Autodesk Navisworks, and .ifc files and additional tools for visualization, web development, 3D PDF publishing and modeling.
The Alliance was formed in February 1998 as the OpenDWG Alliance, with its initial release of code based on the AUTODIRECT libraries written by Matt Richards of MarComp.
Drawings SDK is a development toolkit that provides access to all data in .dwg and .dgn through an object-oriented API, allows creating and editing any type of .dwg or .dgn drawing file, and can be extended with custom .dwg objects. (Old names: Teigha Drawings, Teigha for .dwg files and Teigha for .dgn files; OpenDWG and DWGdirect; DGNdirect.)
Drawings SDK also provides exchange of the following file formats to and from .dwg and .dgn:

Open Design Alliance develops complete interoperability solutions for CAD & BIM for various platform like web, mobile and desktop. Open Design Alliance have huge support from more than 1,200 member companies worldwide, including software developers, manufacturers, government entities, AEC firms, major retailers and other organizations spread across every engineering discipline. If you like Open Design Alliance interoperability solutions you can try their Trial version which provided 60 days full access at the time of writing this post.
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