Cyberduck is free software, but it still costs money to write, support, and distribute it. As a contributor to Cyberduck, you receive a registration key that disables the donation prompt that is displayed after installing or updating Cyberduck. You can use your credit card or bank account without the need to open a Paypal account. You will receive a receipt from Paypal when completing the transaction.
Don't like Paypal? You can still support this project by providing me with some good book to read. I have a amazon.de wishlist.
Feedback. If there was an issue with the Paypal website, please let me know.
