Gone - An ephemeral to-do list
Slack - A messaging app for teams who see through the Earth!
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Twist - Check fewer notifications, do more meaningful work. Twist is the team communication app for calmer, more organized, and more productive teamwork.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
Tealfeed - A knowledge sharing platform to empower creators