DatumPro

DatumPro is the most comprehensive and accurate co-ordinate conversion package available, handling thousands of coordinate systems, including Gauss Kruger, UTM, and Lambert Conic grids With over 600 datum conversions and over 450 Grid Projections, and hundreds of specific TM and Lambert conic conformal grids and all the latest EPSG transformations.

DatumPro not only converts isolated points, but also converts lists of over a million records. And with the integrated datum editor you can even set up you own custom transforms.
For Microsoft Windows 2000, XP1, XP2, VISTA