Wren - Offset your carbon footprint by saving rainforests
Neutral - Offset your carbon emissions, right from your shopping cart
Electricity Map - Live CO2 emissions of electricity consumption
Trip to Carbon - A carbon footprint calculation API for travel.
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.
Decision Game - A fun game to stop overthinking