I'd like to share a javascript implementation of the Spriter format player, https://github.com/deangiberson/spriter-scon-js.
It's designed to be generic but has a dependency on CraftyJS PreloadJS currently, but that's easily removed.
The currently know problem is that it doesn't play well with negative scales. So for example the Ladder animations out of the PlatformPack don't work, everything else works great.
For an example of how it's used look at examples/crafty/hero.js, for now that's all there is, but I'm adding more.
lucid, maybe you could look and let me know if you see why negative scales aren't working?