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Autodesk
Makers of AutoCad, 3D Studio Max, Architectural Desktop, Engineering Desktop and other products.
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Graphisoft
One of the leading architectural CAD software companies in the world.
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Intergraph
Products automate the building professional's workflow from schematic design to construction documentation and facility management.
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Visio
Makers of Intellecad. Low Cost, Full CAD Functionality Drive Compelling Engine for Vertical Applications
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AutoCAD Plug-In Store
Third party plug-ins for AutoCAD, shareware, freeware and purchase.
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CADalog
The AutoCAD shareware clearing house.
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3-D Software's Solar & Architectural Index
Their software draws sun charts and displays shadows of overhangs & trees on buildings.
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