Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Kalam Labs - Twitch for Science
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
MathCrunch - Learn math stress free
Scale - Get human tasks done with just one line of code.
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.