Egg

From ACAPsoft:

Looking for a program to measure how much time you spend on jobs, time chess games, or to prevent you freezing soft-drink cans? Egg is an easy to use timer that can do these tasks. It can count up and down, is settable by second divisions from 1 second up to 45 days, and while its default window size is compact, it can be varied to whatever size you want (including borderless full screen) to allow you to see the count from across the room. Egg can display up to four timers at once, with each one having its own time, font, color (foreground and background), time-up sound and text, repeat and direction settings. Additionally common times are settable with only two clicks from a selection of 12 customizable times. You can also pick a target time that Egg will countdown to. When a countdown has finished Egg can sound a beep or play a common Windows audio file (including MP3s) or it can run a file. The sounds can be set to repeat and both sounds and files can be selected randomly. For the more demanding user, Egg offers several more advanced abilities, including a HTTP remote function, a dedicated chess timer mode, work/rest mode, variable transparency, screen blank, auto repeating timers, keyboard shortcuts, clock sync, time-up warning, flash screen alarm, auto hide buttons, customizable menus, and random alarm times.

Version 1.581 includes clock sync and set-by-time functions and registration related bugfixes