Wren - Offset your carbon footprint by saving rainforests
Carbon Interface - Measure carbon emissions with an API
YAYZY - Track the carbon footprint of each purchase in real-time
Website Carbon Badge - Display your website carbon emissions and raise awareness.
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.
SmogWise - SmogWise offers an alternative to traditional emissions testing by providing consumers with a simple, more affordable way to know if their vehicle is ready for testing, and with participating jurisdictions, a way to submit results directly.