CampaignWith - Teach a class to fundraise for a cause you care about
UpEffect - Crowdfunding for social good products
Dollar A Day - Automatically donate $1 a day to featured nonprofits.
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Public Design Vault - 500+ design tools for public good, all in one place
Daffy - Daffy makes giving a habit.