I've used the old DOS based David Fraser Sailplane program with good success. I really need to enter in some data for modern airfoils though. It's loaded with most of the stuff from Soartech 8 but that's pretty old now.

I've also found other tools online for various functions but nothing for free that does "whole model" solutions. There's Reynolds number calculators, vertical and horizontal tail volume calculators (but you need to know what the final number means) and Mean Aerodynamic Chord calculators but they are all separate.