Templates by EmailOctopus is a series of free, open-source, responsive email templates which can be used in your next project.
Sometimes you need a visual message to get the point across. Use this add-on for visually rich messages, right in Gmail, free.
Cluck crowdsources scam labeling on Craigslist. It gives renters a way to warn others about fraudulent listings.
Kaneslinks is a just for fun project that seeks to map the front page of Craigslist to the startups dominating its many niche categories. For example, I've chosen Airbnb as the current front runner in the "Sublets/Temporary" category. Your (polite) input is welcome!
The Seller is a creative writing and posting service for selling your unwanted crap.