XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
T-Clock Redux - T-Clock Redux in an enhanced fork of Stoic Joker's T-Clock 2010 with ISO week number support...
Timer for Mac - Timer is a complete and professional stopwatch, alarm clock, timer and clock utility for Mac.
ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
Stopwatch - A Java countdown timer and stopwatch. Features a fullscreen and a resizable window mode.
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.