Still a bunch of stuff that runs on ruby that isn't webdev, https://github.com/theforeman/foreman is a big one I can think of. Ruby's quite nice for sysadmin tasks, puppet, chef etc all in ruby iirc.
At work I have been using Ruby for longer than rails has existed. In those days there were lots of neat uses for Ruby (one of the most interesting being at NASA), but none of us knew if it would ever catch on. We didn't care -- Ruby made programming _fun_, and we were happy to use it even if no one else ever did.
It was partly the language that made Ruby fun but also the community. And it's out of this community that projects like chef, puppet, shoes, etc. were born. Matz has called Ruby human- oriented programming, and I can think of like that is human- oriented than community.
EDIT: also cocoapods