Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Momentum - Agile goal and performance management
Send Mail Get Mail - A postcard-sending website.
Exposure New Tab - Get a beautiful photo from Exposure in every new tab
Postacard - Text a photo to send it as a postcard for $3.
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.