Free Rice
is a non profit website that is paid for by advertising space. It is also from the same source that the money used to buy the donated rice is paid for.
The basis behind the website is simple. You play a word game and for every correct answer given 20 grains of rice is given away to help end hunger. As the website grows bigger more rice will be donated at a time. For example Freerice.com started only giving out 10 grains of rice per correctly answered question, but has now grown large enough to give out 20 grains of rice per correct answer and hopefully will grow large enough to give out more.
The rice given out by the website is distributed by the United Nations World Food Program. To learn more and participate in ending world hunger go to the website and start playing.