Description taken directly from 3DS site
"A free, standalone, professional-grade 2D CAD product for professional CAD users, students and educators to create, edit, and view DWG files.
DraftSight runs on Windows, Mac, and Linux, and includes access to online community support, and abundance of learning resources like our “Getting Started Guide,” and an annual product upgrade."
It has been a while since I've used AutoCad but as far as I can tell this software package works in a very similar fashion. If you just need to create simple 2D sketches this software works well.
Draftsight 2D Drawing Software 2014-03-03
AutoCAD like software by 3DS that's free to use