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.
Wheelys Dreams - Crowdfunding for making dreams become real
Treepoints - Fight climate change and earn rewards
UpEffect - Crowdfunding for social good products