Ask HN: How to use my VPS for good?

I rent a low-end VPS.

It is used to host my personal hobby website (very, very low traffic), and for me to generally play around with a Linux server.

I feel like it is a waste that it doesn't really get used that much.

Are there any projects that I could host on my server that would help give back to the open source community at large?

I had thought about maybe hosting a buildbot? I don't want to do Tor or anything that could get my server shut down. I also don't want to commit to anything that would suffer when I eventually lose interest.

Any ideas?