libxmp is a module player library which supports many mainstream and obscure module formats, including Protracker MOD, Scream Tracker III S3M, and Impulse Tracker IT. Possible applications for libxmp include standalone module players, module player plugins for other players, module information extractors, background music replayers for games and other applications, module-to-mp3 converters, etc.
Shellp is a shell helper library. It is intended to make it easier to write commandline-based applications. Commands are easy to define, and can be entered interactively or by reading from a file or standard input. If a graphical workspace is available, a Qt-based interface can be used. Otherwise, an ncurses-based one may be used. If the platform doesn't support that, either, reading from a file is still an option.