There are plenty of timers like this online (Moosti, Tomato Timer), but the best workflow tool is the one you use. This was a quick side project for me in September 2015 to brush up on my web development and build something I would use myself. It takes the best features from all of the similar timers, and drops the cruft.
- Minutes remaining shown in browser tab
- Favicon change and alarm on timer complete (alarms provided by AndYouAreWho)
- Keyboard shortcuts using Mousetrap.js (hit space to pause/resume)
- Custom time with adjustable units