Hourglass - Hourglass is the most advanced simple countdown timer for Windows.

stagetimer.io - A speaker timer in the Cloud

Alarm Clock Tab - Web based time tools including alarms, timers, stopwatch, and time zone converter. Resources also include Tabata, Pomodoro and other useful tips and tactics for managing time and time tracking.

Focused Work - Focus and structure your time effectively, every day.

Online Stopwatch - Online Stopwatch is free to use online tool that allows you to keep track of the important events and tasks that you are performing.

Flow - Stop managing projects from your inbox.