Looking for a software/app demo server

I'm not even sure I'm using the right words to describe what I'm looking, as evidenced by how unhelpful my Google results have been. You know when you go to some services website and they have "Click here to try a demo", and it spins up a container in the background, says "You have 15 minutes until this is shut down, Username/Password: test/test." That. I'm looking for whatever software orchestrates that on the back end.