Creddon - Tweet for a cause and a sponsor will donate $1 to charity
HandUp Campaigns - Assemble your community to donate to those in need
WeAct - WeAct is a chat, task and organizing application for social activism and community outreach.
Dollar A Day - Automatically donate $1 a day to featured nonprofits.
Nifflr - Use computer's processing power to earn money for charity
Poplar Greetings - Send a postcard to someone you love and support a cause.