You can make both the minimum and the suggested prices for a Leanpub book free, but people can still choose to pay if the want to; there's no way to absolutely prevent someone from paying for a book.

However, if you really don't want to make any money from your book, you can share 100% of your royalties with one of the organizations in our Leanpub for Causes program:

https://leanpub.com/causes

After you create a Leanpub book, you can add a cause by going here:

https://leanpub.com/YOUR_BOOK/edit_cause

...making sure to replace YOUR_BOOK with your book's unique web address.

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