IntelliCAD
IntelliCAD is a
fully featured Computer Aided Design program that was developed by Visio,
prior to their acquisition by Microsoft. IntelliCAD is now an open
source program and the standard edition is normally downloadable as
a free trial.
The standard edition provides more functionality than AutoCAD
LT, with features such as an AutoLISP interpreter and the ability to
read and write all versions of the DWG and DXF
drawing file formats. The professional edition of IntelliCAD includes
additional features such as: VBA support, better 3D support,
rendering and a graphics image import function.
Below are some links where
you may download IntelliCAD in its both free trial form and the
retail, professional edition.