os 10

Toggle OS X's automatic proxy on and off.

Native OS X GUI for Mercurial.

Git GUI specifically for Mac OS X.

Classic Mac utility, now a prefpane for OS X.

Play with OS X's text-to-speech system.

Apple Xerox Printer Drivers For Mac OS X.

Communicate vital OS X statistics to iOS.

GNU Emacs editor for OS X.

Tweak the user interaction features of OS X.

AppleScript that runs Mac OS X's periodic maintenance routines.