Send Mail Get Mail - A postcard-sending website.
All or Nothing - Competitive donations for causes you care about.
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...
Klava Fund - Crowd funding for personal matters or grand causes