GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Moot - Moot is a platform for gamers through which they can take part in gaming discussions.
itch.io - An online game marketplace and community.
XIM APEX Manager - XIM APEX Manager allows you to manage mouse and keyboard on Xbox, PS4, and PC, etc.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
GamerLink - A modern way to find and connect with other gamers