for os

WebKit for OS X 10.4 Tiger.

Tweak the user interaction features of OS X.

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

Reveals useful hidden features for Mac OS X.

ActiveTcl: Tcl distribution for Windows, Mac OS X, Linux - ActiveState.

ActivePython: Python distribution for Windows, Mac OS X, Linux - ActiveState.

ActivePerl: Perl distribution for Windows, Mac OS X, Linux - ActiveState.

The official Weather Underground weather widget for Mac OS X

LiquidCD is a free burning Application for Mac OS X

A Dashboard Widget for Mac OS X that displays the battery status.