OpenExam is an enterprise grade service platform for conducting electronic exams. It has partly been developed while working at Uppsala University, with major contributions by Nowise Systems.
The system is open source (GPL 2) and should be fairly easy to get up and running. If you need commercial support, then we can provide it as being the author of most of the code.
Source code is available from GitHub and a system image appliance can be downloaded from the project page. The project is lead and maintained by Nowise Systems.