The Darwine project intends to port and develop WINE as well as other supporting tools that will allow Darwin and Mac OS X users to run Windows Applications, and to provide a Win32 API compatibility at application source code level.
GitX is a git GUI specifically for Mac OS X. It currently features a history viewer much like gitk and a commit GUI like git gui
iStat pro 3.0 is the next incarnation of the chart topping system monitoring widget
Excellent descriptions for useful triggers.