HexInject is a hexadecimal and raw packet injector and sniffer. It can be easily combined with other tools to provide a powerful command line framework for raw network access. It will automatically set the correct checksum (IP, TCP, UDP, ICMP).
DisPass is a passphrase generator that generates unique passphrases formed from a master password and a label, helping you get rid of the bad habit of using a single password for multiple Web sites. It is a console application, but it also has a simple graphical interface.