Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

NumWorks - The graphing calculator that makes learning math easier.