Off the top of my head, https://payments.amazon.com/ is a great alternative. Not sure how the rates stack up, but I definitely trust Amazon more than I trust PayPal. I'm sure there are more alternatives available, I don't know why so many people insist on using PayPal. I think Amazon allows donations cause kickstarter.com uses it, and you don't necessarily get anything if you fund a project. I'm guessing the tricky part here is the "donations", but PayPal certainly has a poor customer satisfaction record.