We currently provide binary packages for RPM and DEB based
GNU/Linux distributions. The sources should work on any Intel based GNU/Linux
without issues and they do work on SPARC/Solaris. Further we are currently
in progress porting to the IBM iSeries platform.
Most of the core libraries already work on MacOS X. Hopefully someone
will step in and complete a MacOS X port (if you are interested, write an email
to feedback@opengroupware.org.
Regarding Windows, check our mission
document. We are not actively working on it, but have it on the radar ;-)
Finally, the sources should compile without major issues on any Unix(tm)
like operating system which is able to host GCC and GNU make. If you managed
to build on your specific platform, please send us
feedback.