What other sites should I visit daily for mankind's betterment?

Every day (well, just about every day), I play on www.freerice.com in which you play a vocabulary game to win free rice which is sent to nations/people in need. I like word games, and it’s pleasant (and satisfying) for me to spend a few minutes a day playing, knowing I’m doing a tiny bit of good in the world. Don’t get me wrong, I know the amount of good that my own contributions make is minuscule.

I also know there are other sites where all you have to do is play a simple game/click on a button, and stuff is donated to people who need it.

I’d like to find ten or so of these sites and spend a few minutes a day clicking on them, just because I feel like it’s the very least I can do.

So, what sites do you recommend?

The Hunger Site

Links to five other sites as well.

It seems there was another food-for-the-hungry site that all you had to do was click on. That was years ago tho.
Edit: And thehungersite was it!
Btw, I spent about an hour on freerice! That is addicting!