itch.io - An online game marketplace and community.
Materia - Materia is a development environment to build advanced mobile and web applications.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Dark Language - Holistic language, editor, and infra for building backends
Ubisoft Club - Ubisoft Club app enables you to get updates about your favorite games timely.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.