DraftSight: free CAD software from Dassault Systèmes

DraftSight is a CAD software (Computer Aided Design) which is free for personal users but still required registration.

The appearance similar to other CAD software like AutoCAD, ProgeCAD, etc. So you will not be confused to use it. Another interesting things from DraftSight is the ability to run on multiple operating system platforms, namely Windows, Mac, and Linux. Linux distributions supported are Ubuntu, Fedora, Suse, and Mandriva. ProgeCAD was also available free for personal use, but not anymore. Master installation is quite mild, around 130 MB. Much smaller than similar CAD software. Much smaller than similar CAD software but still support 3-dimensional drawing.

The Pro version offer more value than the Free

• Toolbox for DraftSight
  A standards-based mechanical symbol library and mechanical annotation add-on.
• Design Library
  The Design Library tab in DraftSight’s Task Pane provides a central location for user-defined reusable elements such as blocks.
• Drawing Compare
  DrawCompare is used to graphically compare entities between two drawing documents.
• Macro Recording
  The quickest and easiest way to start programming with the DraftSight API is to record a macro.
• Batch Printing
  Send a set of drawings and Sheets to printers in a batch job and save batch print jobs to Batch Print List (*bpl) files for subsequent use.
• Layer Preview
  Quickly preview the content of layers one by one or by a set of specified layers.
• PDF Underlay
  Attach pages of a PDF document to a drawing with the AttachPDF command.
• DraftSight APIs (application programming interface) and API updates.
  APIs allow end users to customize and automate DraftSight.
• Product upgrades, new releases and service packs that become available during your entitlement period.

See here for more complete features page.
Then you can register then download from download page.