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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.

Create and publish various diagrams to represent your idea.

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

Organizes and reminds you about important events in your life.

Windows

Windows Mac

HP-15C.Simulator

HP-15C

Free

HP-15C - A Simulator for Windows, Linux and Mac OS X.