GEOPosCalc 18.104.22.168 Free Download
Shareware: You can try this program, but this version has some limited features or time usage restrictions. You should purchase it in order to remove those limits.
GEOPosCalc is an easy to use and powerfull tool for coordinate systems (grid) and datum conversion. It does support more than 200 predefined datums, 20 ellipsoids and 10 coordinate systemsand the ability to define your own datums and ellipsoids.