More then likely you won't make any money off of them. I'm not sure what the rate for donation per user is, but its far less then advertisements (~$1 per thousa

More then likely you won't make any money off of them. I'm not sure what the rate for donation per user is, but its far less then advertisements (~$1 per thousand usually), even for sites that have big begging banner ads. As for services to do this, you can see how wikipedia does it: https://wikimediafoundation.org/wiki/Ways_to_Give https://wikimediafoundation.org/wiki/Ways_to_Give