I know every single person on this forum have their own preference but this one ticks a very box for me: FREE!
All you'll need here
http://www.xtrkcad.org/Wikka/HomePage Tech talk mode ON **I downloaded this over the weekend but I couldn't get the MAC version working (just too complex for me), so I created a Windows 7 Virtual Machine and now is running XtraCAD with that.
The software package (downloading) is quite small, then extracts into a whole bunch of items.
Tech Talk mode OFF **I found a tutorial site and followed it and within a few hours I not only mastered most of it, I also designed a little layout me and Evert are planning... Screen print below...
What I find particularly interesting is that you can load your track templates and then just use that - quite handy for Marklin M track, Kato Unitrack, etc.
