Whether it's quitting time at your job or the remains of the 15 minutes you gave yourself to clean your inbox, it's handy knowing how much time you've got left. This minimalist URL-based web timer provides exactly that service.
The page at cd.justinjc.com, cobbled together by an unknown coder, watches for the text you put after its root domain. Enter cd.justinjc.com/5p, and you'll get a countdown timer to 5pm in your current time zone, with a progress bar and percentage count shown on the page. You can also enter specific timer counts, like cd.justinjc.com/3h15m30s for a count of three hours, 15 minutes and 30 seconds. For a raw minute count, just enter cd.justinjc.com/80. The live count is also kept in the page's title, visible in your browser tabs.