ZwCAD is not expensive and affordable program to support the 2D and 3D  design created on the basis of the Chinese company IntelliCAD ZwCAD Software.

ZwCAD has a very good compatibility with the DWG file format used by industry leaders. Allows you to load raster images, VBA scripting, repair damaged files, and also (Professional version) to create and edit ACIS. ZwCAD manufacturer introduces a number of amendments so that it runs more efficiently and stable.