This looks like an interesting early release of a new 3D engine written in C++ by Gilbert Kearwood. iOS only for now but with plans for cross platform support and some interesting built in features this looks like an engine to keep an eye on.
After a disappointing rejection this week, Daniel Tull has released his iPod look-alike app on GitHub. When I installed this all I could do was smile with nostalgia (even though it wasn't that long ago this was current technology). Given that this will never make the App Store, it is great to see the project released as open source and I am sure there is code in here we can all learn from.
Mark Pospesel has released another flipboard-esque view controller for providing full page flip animations between view controllers. I think I have probably linked to enough of these now that this will be the last but this one looked like a nice clean implementation of the technique so I thought it worth including.
How do you fancy stretching your mathematical muscles a little? Kah Shiu Chong goes over the theory of collision detection using the separating axis theorem which is based around attempting to draw a line between two shapes to determine if they are colliding. This article actually uses ActionScript as the language for demonstrating this technique but the concept is very applicable to iOS as well and the code could be converted easily.