In the past, support has been used to pay for hosting costs, development hardware, books on cryptography and C++, and coffee beans. Jack Lloyd's Amazon wishlist contains a list of books related to development, security, and cryptography that would be useful aids in the future development of the library.
Spare development hardware, particularly cryptographic accelerators, that could be donated or lent to developers would be of great use in getting support for that device included. If you happen to have spare hardware, contact the botan-devel list. Particularly of interest

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Many thanks to everyone who has supported Botan.