Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
Zukitwo - Zukitwo is a Gnome Shell and GTK theme that currently works on Gnome Shell 3.14 and the latest version of GTK.
Dark Mode - A global dark theme for the web
Dark Language - Holistic language, editor, and infra for building backends
Darker Medium - Read Medium stories with happy eyes
adapta-gtk-theme - An adaptive Gtk+ theme based on Material Design Guidelines - adapta-project/adapta-gtk-theme