Hi,
I assume since you are posting in this forum you are interested in FOSS medical software. Sorry I did not get in touch sooner, I do not watch these forums. Currently you have two choices VistA and Care2x.
Generally the run down on these is that Care2x is going to be easier to implement and translate since it is based on PHP and VistA would be more trouble but is also substancially more feature rich. Google can help you find more on each project and you can contact me through
www.fredtrotter.com if you need more help.
-FT