Wren - Offset your carbon footprint by saving rainforests

Creddon - Tweet for a cause and a sponsor will donate $1 to charity

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.

UpEffect - Crowdfunding for social good products

Treepoints - Fight climate change and earn rewards

eSolidar - Charity shops and online auctions to support great causes