This is just a small list of groups and/or organizations that you can help without sending a dime (well most of them at least). Some of the other sites are online activist based, meaning you can help out by signing a petition or two, sending info to friends, recruiting people to campaigns you care about, etc. If you have a recommendation please let me know, would love to add it.
The Hunger Site – Click this site once a day to donate food to the hungry.
Free Books for Kids – Click once a day and donors send books to various groups that advocate literacy for children.
Free Rice – Play an online word game and give free rice as you answer questions correctly.
International Fund for Animal Welfare – Sign online petitions, send e-mails, etc.
Habitat For Humanity – A great organization that has helped house more than 1.5 million people.