iBodger was a free mobile application for creating Warmachine and Hordes army lists, and managing your collection. The last publicly released version was 4.1, and was current through January 2012. At the request of Privateer Press, there will be no more public updates.
But if you like miniature wargames, and want to see what a list building app can do for you, you might want to check out Dark Prevailer.