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Organizes and reminds you about important events in your life.

Momentum is a powerful habit tracker that boosts willpower and helps you reach your goals.

It is designed for Mac and iPhone users to make lists and stay organized.

Free open source todo manager. It grew out of frustration about other programs not handling composite tasks well.

Create and publish various diagrams to represent your idea.

Find out how millions of users worldwide have revolutionized the way they think.

Windows

Windows Mac

Robert McNeel & Associates

Rhinoceros

Free

Rhinoceros can create, edit, analyze and render NURBS curves.