Dollar A Day - Automatically donate $1 a day to featured nonprofits.
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Ecosia - Ecosia is a green search engine that donates at least 80% of its profits from search ad revenue and...
Send Mail Get Mail - A postcard-sending website.
Tab for a Cause - Raise money for charity with each new tab you open
Postacard - Text a photo to send it as a postcard for $3.