I use RR-Track, and while I agree with Marty R on the hassle of putting it on a new computer (never needed support), I find it easy to use and make complex track plans. When I tinker with my "final" layout with over 700 items, not stage 1 or 2, the program will crash if I try to move too many items too fast. This may be more of an issue with my old computer.
I have a free copy of SCARM that I use to look at layout files downloaded from the forum, but I have not used it to build a layout.