BitMessage a Secure email Client and Server
Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide "non-content" data, like the sender and receiver of messages, from passive eavesdroppers like those running warrantless wiretapping programs.
Vanity Address Generator
"Vanitgen" is an interesting program if you are in any way interested in the development and fulfillment of the Bitcoin industry. The Bitcoin currency system utilises a wallet system that can generate a unique 56 Bit random number to receive currency transfers or payments. All address bits of this type start with a single prefix "1" plus a continuous random sequence of 55 additional alpha numeric characters that comprise of a Public and Private address that form the Bitcoin address system, not the Bitcoin currency itself.