They use this software,
Which to a layman like me seems pretty neat and decently priced. As I have never used it I can not say how it performs personally.
I like this explanation they give about their interaction with Debian.
This is a strategy that Univention shares with a large number of manufacturers, including some very well known ones. For this reason, the Debian Project represents a shared platform also maintained by many other companies and research facilities, whereby manufacturers and users always also benefit from the efforts of others. Consequently, the cooperation of companies like Univention with freelance developers and public institutions in the scope of the Debian Project is also one of the best and most successful examples of Open Source software.
ZiiK one of the organisations helping out the Afgans in a big way are German and have been helping and promoting open source to underdeveloped countries since 2000.