Wren - Offset your carbon footprint by saving rainforests
UpEffect - Crowdfunding for social good products
YAYZY - Track the carbon footprint of each purchase in real-time
Tickr - TICKR is GTK-based RSS READER application which displays RSS FEEDS in a TICKER bar on your desktop.
Klima - Go carbon neutral
Creddon - Tweet for a cause and a sponsor will donate $1 to charity