Terry Worona with a very attractive implementation of a non modal alert message view for iOS 7. Support for tapping to dismiss or optionally perform a callback and several different styles. Worth looking at if you are looking to remove some UIAlertView modals from your iOS 7 apps.
Nick Lockwood with a new set of serialisation/deserialisation classes. Support is included for bootstrapping seed data and also pointers/references to other objects with an aliasing feature. Looks really good.
Jordan Kay with a new project based on some initial work from Jonathan Wight around putting together a smarter table view. Mensa includes support for auto sizing cells based on their content (as long as Auto Layout is being used) and view controller based cell prototypes to allow easier reuse of cell based content across your app. Some interesting ideas here.
Klaas Pieter Annema with a lightweight REST client for Objective-C. Based on top of AFNetworking with simple routing, serialisation and mapping built in. Biggest downside I can see here is that there are quite a lot of dependencies needed, including AFNetworking 1.x which may cause conflicts with your app if you are using 2.x.