...Much of the foundation (besides UIKit) is built off of curry. curry is a submodule you'll need to pull down with tapku to run. Tapku is an open-source project I started back in the early days of the iOS SDK. Summer of 2009 to be exact (shout out to my peeps that juggle and recite pi). It featured elements that made it popular like the calendar grid UI. (The kid got emails from the archdiocese of New Orleans, no lie.) Over time, anything that I'd use often for different projects would wind up in tapku after I felt it was A. something that would be helpful to share between projects and B. up to the standard of sharing with the community.
MacFilelight is a clone of the KDE Filelight utility. It provides a pretty and user-friendly interface for discovering what's taking up all your disk space.
iTmsBackup is a Mac OS X application that backs up audio files purchased from the iTunes Music Store. Backups (and incremental backups) can be made to a hard drive or other removable media, allowing a more flexible backup solution than Apple's iTunes.