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GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Giac/Xcas - Free computer algebra system
itch.io - An online game marketplace and community.
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.