What to do with left over server capacity (CPU and RAM)?

We currently have a couple servers at a datacentre, solely running clients webapplications and some cloud based services. Now, one of these servers has 2 Xeon’s and a whopping 64GB of RAM but currently only serves as a backup/website server with traffic not even reaching a few tens of GB’s a month. Take into account that power draw is not an issue in this scenario. You can imagine the overall load on the thing barely ever reaches the 1%… So, what to do with all this leftover horse power? I was thinking about setting up some kind of platform of renting out Minecraft (or some other) game servers or something, but this would require quite a bit of work to get all set up. So there must be an easier solution to utilize that leftover performance and still squeeze a bit of money out of it, right? There must be a service or something that allows you to use your leftover CPU power and RAM capacity (because that what this is mostly about, small webservers don’t particularly need those 64 gigs tbf…) for something useful, whatever purpouse that may be. It’s kinda like the idea of that whole protein folding thing but then not free basically.

Anyone know of any such service/thing?

You could use for speeding up compilation.
https://www.incredibuild.com/