sleek is a todo.txt manager, free and open-source (FOSS)
yapomo - Yet Another Pomodoro Timer
Pomodoro® time management assistant for Chrome
Simple and visually-pleasing Pomodoro timer
Toggl Desktop app for Windows, Mac and Linux
An Pomodoro© timer written in python
Simple timer for the Pomodoro Technique
Enhance your efficiency by timing your work and breaks
Agile + Pomodoro Time Management Freeware
Reliak Timer is a timer tool that supports the Pomodoro Technique®