Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
Klima - Go carbon neutral
Padbury Clock Screensaver - Minimal screensaver for Mac
Wren - Offset your carbon footprint by saving rainforests
Xscreensaver for Windows - XScreenSaverWin is a Windows port of XScreenSaver. 204 screensavers in XScreenSaver were ported.
Website Carbon Calculator - Find out the how much CO2 your website emits