ExperimentalVM is a part of the Computernewb website that is used to test new features of CollabVM before releasing them to the public. It is usually not online and is prone to various bugs, so it is not recommended to use it for anything other than testing purposes. When ExperimentalVM is online, an announcement is usually placed on CollabVM. Users are encouraged to find and report bugs, exploits and leave feedback.
It is currently offline, but it will be used for a live CollabVM 2.0 beta test when it is ready.