It is the smallest droplet (512 MB, 1 vCPU), but I figured that's enough for something.
Or you could always just turn your server into a little bitcoin miner. Probably won't make any money from it, but it might be fun to do regardless.
Now, on a more serious note: you could host your friend's sites (and probably can do a split of the payments), use it as a host for various tests (if you are a developer).
If you are living in a non US country you could make an instance in US then use it as a proxy to access various services that requires you to be in US (hulu, netflix, etc)
https://en.wikipedia.org/wiki/List_of_distributed_computing_...
Run a dedicated server for whatever games you could manage with 512 mb ram.
But you can look here for basically on-liner: https://news.ycombinator.com/item?id=7586775 Also there is "full" solutions https://www.digitalocean.com/community/tutorials/how-to-inst...