Adena Schutzberg alerts us in All Points Blog that Microsoft has bought out Caligari for use with its Virtual Earth site. She writes, "I think I've heard of the company from my days in CAD. Perhaps the CAD folks will have something to say about this?"
It's not CAD, but one of the very early rendering technologies for PCs. I had to check the archives of upFront.eZine to recall exactly what Caligari was. I found that upFront.eZine reported in October 2001:
Caligari says it will resell IMSI's TurboCAD 2D and 3D drawings CAD software, while IMSI will resell Caligari's trueSpace 3D modeling and animation program. Press release notes indirectly that neither can read each other's files, but require intermediate translation to DXF, VRML, etc.
Caligari CEO Roman Ormandy talks about it here.