Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Charitable - A WordPress donation plugin that gives you full control over your fundraising experience.
WeAct - WeAct is a chat, task and organizing application for social activism and community outreach.
Give - A WordPress plugin for easily collecting donations
Nifflr - Use computer's processing power to earn money for charity
GiveForms - Your Go-to Digital Fundraising Platform