"You play. We give. No catch."
GamesThatGive is another very intriguing site that utilizes advertisement money to give to causes, much like FreeRice and The Hunger Site. Unlike those two sites, though, GamesThatGive is oriented around causes other than food, such as education, veterans, etc., as well as games, as the title gets across quite well.
How you earn money for the available causes is by playing games. You can bring up such games as Solitaire, Gems, FreeCell, and Bubble Burst, in your browser. You play these games, as sponsored by select advertisers, and the cause gets money for the time you spent playing (and, thus, the time you spent viewing the ads of the sponsors).
GamesThatGive does this by changing the background of your game to one of the select advertisers (such as Dominos Pizza or Propel Fitness Water), which you will view the entire time you play the game. For the amount of time you are playing, you earn the GamesThatGive site advertisement money. They, in turn, send a portion of the money earned to the cause you selected (you may permanently select a cause by selecting one here, if you are signed in).
While this sounds like a much more fun alternative to what some may consider dull trivia or clicking a button once a day, it's also good to note something very important. GamesThatGive only donates '70% of... ad revenue' to the charity you chose, which means they do make a profit instead of donating the full amount earned.
However, the selection of charities is actually quite respectable; there are currently 14 to choose from. Here is a list of available charities to select on the site:
The Wilderness Society
Iraq and Afghanistan Veterans of America
Breast Cancer Network of Strength
American Heart Association
Ronald McDonald House Charities
If you're the kind of person who takes pleasure from doing something you enjoy and helping the world at the same time (and who isn't?), then get on over to start a game and help a cause: GamesThatGive.