1)   progeCAD 2006 Professional 8.0.18
ProgeCAD IntelliCAD natively reads and writes AutoCAD DWG files, no need for conversion! Industry standard AutoCAD Commands. AutoCAD Menu, Script, Font Compatibility, AutoLISP Compatibility! Advanced Rendering Options, 3D ACIS Solid Modeling.

 2)   progeCAD Smart IntelliCAD 8.0.18
progeCAD 2008 Smart!, powered by the most recent IntelliCAD engine, is derived directly from the professional versions of progeCAD, and maintains all the base functionality of its outstanding parents in a set of installation that is compact.

 3)   GStarICAD 2008 Professional 2008
GStarICAD is the geniune low cost CAD drawing software based on IntelliCAD,and it is 99% idential to AutoCAD,and it is compatible with AutoCAD.GStarICAD offers a 30days free tryout after free download this software

 4)   ZwCAD 2008i
ZWCAD 2008i is a Reliable and cost-effective CAD solution! It is highly compatible with AutoCAD. With its powerful drafting features, ZWCAD 2008i can help the users to create professional CAD drawings and let their design more effective.