NOTE: these projects are severely outdated and here only for the archive purpose. I haven't been putting time into OSS work since the end of 2013. They're here only for the reference.

Alcatraz [archived] is the missing Xcode package manager, that lets you discover and install Xcode extensions.
xcpretty [archived] is a fast and flexible `xcodebuild` formatter.
xclisten [archived] runs Objective-C tests or installs pods each time you save a file
Objective Sugar [archived] is a set of Functional additions for Objective-C inspired by Ruby.
Objective Record [archived] is a lightweight CoreData wrapper inspired by Active Record.
Contributions, ex core team: CocoaPods, Kiwi BDD, Bubblewrap