IntelliCAD
is a clone of AutoCAD, whose technology is held by ITC
consortium . Many companies develop from this technology
their own version of IntelliCAD. The interest of this program,
in addition to its compatibility with Autodesk's Dwg format,
is its low price: for approximately half the price of AutoCAD
LT, you can open AutoCAD files, print them etc.
Among all the proposed versions, one stands out: BricsCAD, by Bricsys, is the closest to AutoCAD, and the one to try first.
Most add-ons of the site can run on BricsCAD.
Click here to see the list of the available addons for Bricscad