Gone - An ephemeral to-do list
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Effortless - Stay focused and beat procrastination on your Mac.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
Memory by Timely - An intelligent timeline of everything you did in a day.