INTELLICAD
IntelliCAD is CAD-software, that looks a lot like AutoCAD and of which anyone can make his own version. The IntelliCAD Technology Consortium controls the developments and to be able to use the IntelliCAD sourcecode a company has to become a member. Among others there are members like Autodsys Cadian,progeCAD, Cadopia and ZwCAD that create their own CAD-software. The IntelliCAD Technology Consortium has over 30 members.
There is special attention for the exchange of drawings and additional software between IntelliCAD and AutoCAD:
support of the .dwg file format in cooperation with the Open Design Alliance
Full compatibility with AutoCAD Command Line, menu (.MNU) and script (.SCR) files ( AutoLISP macro language), hatches, fonts and true type fonts.
new: developing method DRX, comparable to AutoCAD's ARX.
Other features:
Complex linetypes
Multiline Text
Lightweight polyline
Draworder
Audit & Recover
ADS support in most applications
Raster image display manager