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Giac/Xcas - Free computer algebra system
itch.io - An online game marketplace and community.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.
Ubisoft Club - Ubisoft Club app enables you to get updates about your favorite games timely.