DraftSight is a 2D CAD program that allows to create, edit, print and work with DWG files. Is compatible with all major operating systems, in all flavors.
Is intended both for beginners and professionals that needs a free tool to maintain or extend their DWG projects. Developer’s website offers a lot of training, how to articles and videos, but also DraftSight has a large online community being used by a large number of users.
Standard version is a free AutoCAD alternative and you can make complete tasks and work with DWG files without limitations. Paid upgrades to Professional version will allow you to use additional features such as toolbox, design library, drawing compare, batch printing while Enterprise version offers telephone and email support plus a network license.