The OpenCoin project provides resources for creating virtual currencies: documentation, format and protocol definitions, an open-source reference implementation for issuers, users and traders. It is based on David Chaum's electronic cash concept.
cryptshell is a shell used for analysable code (eg anything before wwII). It automates letter substitution, transposition, and has modules useful for breaking various weak ciphers (enigma, substitution, vinigre). It has no real practical value.
Secure Email List Services (SELS) provides software for private email discussion lists compatible with common email clients. SELS enables list members to exchange encrypted messages without exposing plaintext messages on the list server.