IMSI The developers of TurboCAD, with online store, trial downloads, documentation, and user gallery. http://www.turbocad.com/

Davids TurboCAD FAQ FAQs for TurboCAD compiled from various forum threads and user contributions. http://www.home.aone.net.au/hvp/David/TCFAQ/Index.htm

Winstons TurboCAD Page Features turorials and articles on using the various features of TurboCAD. http://www.cadcourse.com/winston/

TurboCAD File Library An open TurboCAD user group that administers and maintains an archive library of files for use with TurboCAD, accessible to members. http://groups.yahoo.com/group/TurboCAD-File-Library/

Tom's TurboCAD VBA Topics A personal repository for bits of code and knowledge about programming TurboCAD with VBA and VB. http://throsn.tripod.com/tcadmain.html

TurboCAD User Forums Discussion and support forums for TurboCAD users by IMSI. http://www.imsisoft.com/forums/Main.cfm?CFApp=200

TurboCADables TurboCAD hatch patterns, color palettes, and related resources. http://www.al-ki.com/tcad/

IntegrityWare, Inc. Offers libraries for geometric solvers, trimmed surfaces, and polygon optimization, including visualization features. http://www.integrityware.com/