DataKit: It's like Parse, just open source. Written in node.js and ObjC.
github.com
github.com
I had a brief skim over the code and I can't see any access control stuff so I'm guessing this key has full access.
If that's the case, I can't see how this could ever be suitable for use in any real app.
Parse provides you with a few different keys and also offers ACL functionality. I'm still not too crash hot on expecting the client to setup an ACL on their own objects though...
Here's the discussion that got me thinking about it: http://news.ycombinator.com/item?id=3534921