mp3_check helps to identify in explicit detail MP3s that do not correctly follow the MP3 format. It also looks for invalid frame headers, missing frames, etc., and generates useful statistics. This can be especially important when building an archive, and you want high quality MP3s.
PHP Kickstarter is an extremely powerful, flexible, and user-friendly kickstart solution. The administration is Web-based, and with macro and include file substitution capabilities, it is ready for enterprise-class jobs. Also, it is all based on flat files (no databases), and thus has no dependencies beyond PHP, so it is easy to install.
cryptod is a program that listens on a TCP port or unix socket, receives information on that port, and performs the requested action. Common actions are aes256 encrypting/decrypting, base64 encoding/decoding, and RMD160 hashing. Interfacing with the daemon is well documented, and you are also easily able to obtain statistics from the server.