From progeCAD USA:
iCADMac is a user friendly 2D/3D CAD software for MAC OS X which reads and writes DWG format drawing files. "AutoCAD Like" DWG CAD software, create, edit, and publish DWG based design compatible with AutoCAD. Little or no learning curve for AutoCAD or AutoCAD LT users, affordable DWG CAD design, only 1/5th the Price of AutoCAD, more powerful than AutoCAD LT! It's easy to use (thanks to the high level of compatibility with AutoCAD), and it's easy on your wallet (you pay only a fraction of what that other software costs).
iCADMac is the ideal choice for low cost CAD. Design, revise and create technical documentation, without giving up the quality and compatibility you've come to expect. iCADMac is easily the best choice for those who want a quality tool for performing their work, yet don't want to spend a small fortune to obtain it. Highly customizable user interface that is familiar to CAD users. iCADMac costs just 1/4 the cost of AutoCAD software, yet offers similar functions. DWG format drawing files that are fully compatible with AutoCAD DWG files, no conversion required.