Carlson GIS 2011
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One of the least expensive CAD applications in the marketplace is Carlson Software's GIS application. It ships with a complete version of IntelliCAD 6.6, a robust, DWG-compatible CAD platform that has most of the features of its AutoCAD counterpart. If you are looking for an inexpensive CAD package, Carlson GIS might just be the perfect fit.
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http://www.raptsoft.com/carlson_gis.asp