Wren - Offset your carbon footprint by saving rainforests
Treepoints - Fight climate change and earn rewards
Joro - The Fitbit of carbon emissions
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.
Website Carbon Calculator - Find out the how much CO2 your website emits
Stripe Climate - Remove carbon as you grow your business