I was wondering if anyone could recommend a free or low-cost software that could be used for working up designs? Basic 2D style drawing would be good, particularly if you can do things like add dimension notes. Being able to work something up in isometrics would be a bonus. It would be nice if it allowed free-hand drawing as well as pre-made shapes. It would also be nice if it allowed erasing - something that Visio, as a vector drawing software, doesn't do. If you overshoot a line and just want to touch it up, you have to re-draw the line. I've done work in Visio, but it hasn't been really friendly in this aspect. I used to work in AutoCAD, but no longer have access and my skill there is dried up like a fork off a dead tree. Any suggestions folks? I'm looking for something I can run on a PC. No MAC and no iPad (or any pad) available at this time. I've got ideas in my head and would like to put them down on something other than paper.