Sporttracks should not work. Had a look at their webpage. For Mac see: Golden Cheetah (http://www.goldencheetah.org/), as far as I know it is OpenSource. TrailRunner (http://trailrunnerx.com/index.html) Then commercial: rubiTrack (http://www.rubitrack.com/), iSMARTtrain (http://www.ismarttrain.com/) and Asscent (http://www.montebellosoftware.com/). I have not tested any of them with my Edge 500, but I am also not happy with GTC. Perhaps, someone can comment?