From Killet Software:
Transdat Geosoftware executes coordinate transformations and geodetic datum shifts between many coordinate and reference systems of world-wide, at high precision and high speed. TRANSDAT Coordinate Conversion supports thousands of coordinate systems and geodetic datum shifts, user-defined systems, INSPIRE, NTv2, BeTA2007, GPS, continental drift, many file systems, and ESRI-Shape.
What's new in this version:
Version 16.52 has added 3D transformations to the program.