I have fallen in love with FreeCAD lately. Not just because it is free! But i find working with it easier than the feature filled premium software. Initially i was using LibreCAD, quite basic but works and produces nice drawings just like AutoCAD would at a fraction of the cost.....well....for free actually! 

If it gets a little facelift and a commanding, it will compete on the same level with the costly premium applications in the market.