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

Create and publish various diagrams to represent your idea.

Organizes and reminds you about important events in your life.

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.

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

Windows

Windows Mac

a-sharp.opal

Opal

Free

Opal lets you organize ideas, reports, lists, etc. in the form of an outline.