Goban

Play Go on Mac OS X…

GPGMail

A plug-in for Apple’s Mail (on MacOS X) and MailViewer.app (on old MacOS X Server 1.x), providing a front-end to gpg for some operations. GPGMail extends Apple’s Mail/MailViewer application and allows you to read and send PGP authenticated and/or encrypted messages. You can use PGP for plain and MIME messages, following RFC 3156. Source code is available.

OCUnit

The testing framework for Objective C in the Mac OS X, Mac OS X Server, GNUSTEP, YellowBox/Cocoa and WebObjects/Objective C environments. Since 2005 OCUnit has been distributed by Apple as an integral part of XCode.