1. UlikitMiscellaneous open-sourced MacOS Cocoa code by yours truly.
2. UksyntaxcoloredtextdocumentAn NSViewController (and optional document class) that implements syntax coloring and code editing-related features in an NSTextView.
3. StacksmithAn intuitive software erector kit targeted at people new to programming, but with enough potential to stay useful once they've learned, inspired by HyperCard.
4. UlinetsocketA Cocoa wrapper around Unix sockets based on NetSocket by Dustin Mierau.
5. HidremotesdkUnofficial Github repo hosting Felix Schwarz's Apple Remote class.
6. UKSoundWaveformViewA simple example for a view that displays a waveform illustrating a sound file's contents.
7. UKDiffViewA view that takes an original file and a text-form diff and displays it in a graphical form, and can selectively apply the modifications it contains.
8. IconFamilyTroy Stephens's Cocoa/Objective-C wrapper for Mac OS X Icon Services’ “IconFamily” data type. Its main purpose is to enable Cocoa applications to easily assign custom file icons from NSImage instances.
9. UKFileWatcherA bunch of classes for detecting changes of files and folders. Extracted from UliKit. Home of UKKQueue.
11. AppKitForClassicToy project that re-implements bits of AppKit for classic MacOS 9 on 680x0 (and emulated on PowerPC) using Metrowerks CodeWarrior Pro 6's MWObjC Objective-C compiler.
12. oldiconutilA command-line tool to postprocess iconutil-generated .icns files to make them compatible with Mac OS X 10.5
13. cpptoswiftHack that'll hopefully one day auto-generate a Swift wrapper around C++ source code.