Axiom - Axiom is a general purpose Computer Algebra system.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Zontroy Generator - Let the computers do what they can
Doit.im - Doit.
CrowdSync - Automate repetitive work with people
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.