"Scala is a powerful software tool for experimentation with musical tunings, such as just intonation scales, equal and historical temperaments, microtonal and macrotonal scales, and non-Western scales. It supports scale creation, editing, comparison, analysis, storage, tuning of electronic instruments, and MIDI file generation and tuning conversion. All this is integrated into a single application with a wide variety of mathematical routines and scale creation methods. Scala is ideal for the exploration of tunings and becoming familiar with the concepts involved. In addition, a very large library of scales is freely available for Scala and can be used for analysis or music creation."
With Scala you can create script and "dump" files that can be used to tune a large number of keyboards, synthesizers, virtual instruments and plugins to be able to use 432Hz tuning. This software could be hard to work with for those people who do not have much experience with micro-tonal music.
More info: http://www.huygens-fokker.org/scala/