GAVO's Data Center Helper Suite is a collection of (primarily) python modules to help you in setting up and running a VO-compliant data center; some parts of this code are useful for client-side applications, too. All parts of DaCHS are GPLed Free Software.
The full suite is not really released yet, and if you plan to use it, you should really contact us (see contact info a page foot). Thus, there is no "official" downloadable package, but you can (and should) access our subversion repository.
Currently, DaCHS supports:
Support for further DAL protocols (e.g., SLAP, etc) is pending data to deliver through them. Contact us if you need it.
GAVO DaCHS should run on POSIX systems supported by our dependencies. However, you are advised to set up a Debian machine to run it.
To see DaCHS in action, check the GAVO data center.
More information, in particular on the non-trivial installation, can be found on our documentation page.