Gone - An ephemeral to-do list
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Sketch - Professional digital design for Mac.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
Invision - Prototyping and collaboration for design teams