On noobslab.com you can get a short overview on Univention Corporate Server: What is UCS? How does it work and what are its functions? The article answers these and more questions and also provides a tutorial on how to install UCS as a virtual machine.
In the end the author summarizes:
Univention Corporate Server (UCS) is a very sophisticated operating system for identity and infrastructure management for organizations. The setup is straight forward and easy to make.