Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Website Carbon Calculator - Find out the how much CO2 your website emits
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Wren - Offset your carbon footprint by saving rainforests
Wallcat - Enjoy a new, beautiful wallpaper, every day.
Klima - Go carbon neutral