The Leanpub for Causes program lets authors share some or all of their royalties with a participating nonprofit or charity if they choose to do so. When you buy a book that is part of the program, you'll see how much of your purchase price is going to the author's chosen cause.
If you would like to see a new cause added to the program, please contact the organization and ask them to sign up on the Causes page here: https://leanpub.com/causes.
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Interested in creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book