trueSpace was a 3D-authoring tool, which provided NURBS-based modeling tools, realistic rendering and advanced surfacing features. In 2008, its creators Caligary Corporation were bought out by Microsoft. Since May 19, 2009, TrueSpace has been discontinued.
trueSpace file formats
TrueSpace object (.cob) and scene (.scn) files have been supported for quite some time, as an alternative to the Renderware format. Commonly used for avatars and other more complex objects, these files are still seen throughout the Active Worlds universe. This particular file type is generally limited to the trueSpace modeling software.