Ecosia - Ecosia is a green search engine that donates at least 80% of its profits from search ad revenue and...
CampaignWith - Teach a class to fundraise for a cause you care about
HandUp Campaigns - Assemble your community to donate to those in need
Laoshi - Learn new words with flashcards to master Chinese faster
Tab for a Cause - Raise money for charity with each new tab you open
Creddon - Tweet for a cause and a sponsor will donate $1 to charity