RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.
mGBA - mGBA is an open source emulator of the Game Boy Advance. The goals are speed and accuracy.
Dark Language - Holistic language, editor, and infra for building backends
DeSmuME - DeSmuME is a freeware emulator for the NDS roms & Nintendo DS Lite games created by YopYop156.
adapta-gtk-theme - An adaptive Gtk+ theme based on Material Design Guidelines - adapta-project/adapta-gtk-theme