If you buy a lot from Amazon, you can also choose Internet Archive as your supported charity.
(I was also going to suggest nominating Internet Archive as a charity for Humble Bundle purchases as well, but it seems like they no longer support choosing your own charities.)
This is a good idea. On AmazonSmile I currently support National Park Foundation but can think of supporting this one too in the future (maybe rotating basis quarterly). I am curious which other similar nonprofits HNers think are available on AmazonSmile to think of donating to?
(I was also going to suggest nominating Internet Archive as a charity for Humble Bundle purchases as well, but it seems like they no longer support choosing your own charities.)