The latest Facebook application has just been released and once again was prototyped in Quartz Composer using the Origami add on that was released at the end of last year.
Fastcodesign has a great article that goes into how the Facebook Design Team went about prototyping the application.
Head over to fastcodesign to read more http://www.fastcodesign.com/3025932/facebook-develops-a-photoshop-for-interaction-design-and-its-free-for-anyone-to-use
Origami is a new Plug-in and Macro set for Quartz Composer that expands it’s functionality as a design tool. Launched recently by the Facebook Design Team ( http://origami.facebook.com/ ) it provides a set of tools intended to make interaction prototyping easier.
The main Plug-in adds a few nice features and finally brings Retina Support to the QC Editor. As well as the Plug-in it also install a bunch of macros that replicate a lot of in built functionality and repackages them in a more user friendly manner. There is also a bunch of example files to get show it all in action.
It look like the project could bring some new people to the world of Quartz Composer which will be a great thing. There has already been some updates to the github page as users have posted about bugs.
Check out https://github.com/facebook/origami for the latest build
http://facebook.github.io/origami/ for the latest installer.
Also worth checking out is this interview with one of the Facebook design team talking about their ideas behind using Quartz Composer.