Website Carbon Calculator - Find out the how much CO2 your website emits
Momentum - Agile goal and performance management
Wren - Offset your carbon footprint by saving rainforests
Gratitude Flow - Gratitude Flow is a web extension that allows you to share and receive gratitude on your new tab with real people around the world.
Klima - Go carbon neutral
New Tab by Flickr - Get a beautiful photo each time you open a new tab