Windows Mac

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Teaches mathematics and solves problems

Provides introductory learning materials for engineering

PhET is a collection of physics simulations from University of Colorado

Creates and edits biological sequence models

Designs and updates printed circuit board projects

Artha is a free cross-platform English thesaurus that works completely off-line

Windows

Windows Mac

Sam Tupy productions

Free

It is a multiplayer game in which you will have to you survive in the wild