Software development is the core activity of the Open Design Alliance. The ODA has 1,250 subscribers who are benefiting from the up-to-date technology provided by the ODA and integrating ODA in their solutions. ODA is a development platform that provides tools to create a rich variety of engineering applications. These include custom data access and editing, automation, general-purpose visualization and markup, and full-scale CAD systems. ODA supports the use of .dwg, .dgn, .prc, .rvt, .rfa and .pdf files, as well as the import and export of many other formats. It runs on all major desktop, server, and mobile platforms, and is available for C++, .NET and Java developers.