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itch.io - An online game marketplace and community.
Green Man Gaming - A digital distributor for video games.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
ARPAY - Buy gift cards at ar-pay.com, which allow you to access your favorite internet services: online games, e-wallets and console games, online shopping cards and many more!