Draftsight is a clone of Autocad Lt 2009 as far as my comparison. It uses the exact same commands and short cuts.
I use Autocad 2009 and i can open Draftsight files in Autocad and Autocad 2009 files in Draftsight. They both recognize that you are opening a file that is created by another program but you can edit them easily in you want.
If you use Autocad 14 you should be able to open up all of your Acad 14 files in Draftsight without any problems.
The main difference with Draftsight is it does not have the advance 3d commands of Autocad. It does have the same 3d view commands just not the advanced commands. So it is basically a 2d Cad program that uses the Autocad command structure.
It also has a why smaller footprint than Autocad. You should give it a try, might be perfect for you as it is free. There is also a comprehensive tutorials and a forum on the Draftsight website.
Last edited by Roguedog; 09-30-2013 at 11:11 PM.