Jonas Budelmann on his open source project Masonry:

Harness the power of AutoLayout NSLayoutConstraints with a simplified, chainable and expressive syntax. Supports iOS and OSX Auto Layout.

Frank Gregor:

CNGridView is a (wanna be) replacement for NSCollectionView. It has full delegate and dataSource support with method calls just like known from NSTableView and UITableView.

Interesting project. Includes the caveat (which should be included in many early draft open source implementations):

The code is provided as-is, and it is far off being complete or free of bugs.

Yichun Zhang is the author of sregex, a non-backtracking regular expression engine designed to work on large data streams.

The syntax follows Perl 5 regex. There is an included test suite, also written in Perl.

If you’ve found a need to work with JSON (including with the iPhone), I want to point you to an excellent Google code project: The author of this framework can be found here.

This framework implements a strict JSON parser and generator in Objective-C. It’s easy to work with and can be used across any number of projects with ease.
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