Mars Pathfinder 1.0, the one-screen program, is available here for free.
Mars Pathfinder 2.0 is a full scale windows optimization program. It has nice graphical print outs, data outputs, and help files. It's a model of the 2001 NASA mission, using the prototypical 5 thrust mission profile. This is the program described by all the pages on this website. You can download the full windows program here for free.
