One of my favourite frameworks! I abandoned Rails for Camping when I saw how easily I could grok the entire framework. One thing I liked doing when building web apps was to rip out the View infrastructure so that I could more easily render alternative formats. I've written a couple of articles on Camping here [1], [2] that people might be interested in (be gentle, my writing wasn't as good 6 years ago)
https://github.com/camping/camping