Dosh - Cash back, auto-magically
WeShelter - Unlock a donation when you pass a homeless person in NYC
Charity Miles - With the usage of this application you will always able to earn a win-win fitness situation for your goal.
TAP London - Tackling the homeless problem together
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Catchafire - Use your professional skills to help charities