Crank is short for "CRyptANalysis toolKit", and its overall purpose is to provide a powerful and extensible GUI environment for solving classical (pen-and-paper) ciphers, providing as much automation as possible. Initial focus is on the cryptanalysis of monoalphabetic substitution ciphers. Screenshot here.
43b9d503e9d8b4635e482231dd96affb2ffe28edff826779068e54ad748525e7