Poppy is a small Perl script that will individually retrieve only the headers of mail messages from a POP3/IMAP server and then allow you to view, save, or delete each. This is especially good for systems with limited resources like limited disk space, slow connectivity, or no GUI. It is also good for managing your mailbox when your normal mail reader is setup not to delete mail off the server or is having problems downloading large emails.
SoX is the Swiss Army knife of sound processing tools: it can convert sound files between many different file formats and audio devices, and can apply many sound effects and transformations, as well as doing basic analysis and providing input to more capable analysis and plotting tools.
Software which extends the functions of Asterisk with end-user Web clients.