Kleene's retrospection theorem in practice (code that writes itself)
LogJam (perl script to jam an http server log file)
Modulo group operations in BC (exponentiation, inverse) For more information on BC and many other number theory functions for BC, see prof. Keith Matthews' great page on the subject
Broadcom capability in OpenCryptoki
Code to compute Ciphersaber human memorable test vectors (written by Adam Back)