isymchoose can automatically determine which symbols (functions, types, enumerators, etc.) are available in a given C language source file and present you with a list of completion possibilities, including return types and argument lists. With a little help, it can also display documentation for symbols. At its simplest, it functions as a keystroke-economical, context-sensitive symbol completer. However, additional features exist that aim to let the programmer remember in general, fuzzy terms what their libraries can do and quickly find and insert what is needed, rather than having to remember or awkwardly look up exactly what everything is called, what arguments are required, etc.
rawrec and rawplay are utilities designed to provide the user with a simple way of recording and playing raw audio data. Options exist to control the timing and padding of the run as well as the dsp parameters. The main ring buffer size and buffer fragment size can be set if desired. These programs are particularly useful in conjunction with the sox utility.
soundgrab provides a cassette deck-like command line interface (ff, rw, jump to position) plus some other commands that let you easily select and save your favorite parts of a big volume of Ogg or raw audio in Ogg, FLAC, raw, cdr, or wav format. If you have a favorite radio show that plays hard-to-find things at a time when your boss insists you should be at work, you can record it, then come home later and save your favorite parts.