This service is developed by aeris.
Source code is available under AGPL v3 license :
This project contributes to improve Ruby too.
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You can support development and hosting for this service:
Bitcoin 1aerisnnLWPchhDSXpxWGYWwLiSFUVFnd
Liberapay, for recurring donation, require a account (but respect your privacy)
Donorbox, for recurring and one-shot donation, doesn't require an account
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Paypal, what to say about this service and your privacy, but already used by most of the world