I’d been using DraftIT for a number of years when I wanted to be able to work on plans using both my home computer (Win XP) and work laptop (Ubuntu Linux) while the family uses the home PC. After some searching, I came across what is now called LibreCAD. It takes a little while to adjust (I suppose this is always the case) but I must say “it works for me”. It isn’t too hard to pick it up by trying and it is possible to do simple stuff without having to understand everything it does.
Best of all, it saves as DXF format, while this only comes with the “Pro” version of DraftIt which costs £99. DXF is a de-facto standard so this makes the drawings more sharable and – maybe more important – gives me more confidence in being able to read/alter drawings for longer (e.g. if the makers of DraftIT vanish).