Siren is a text-based audio player for Unix-like operating systems. It supports Ogg Vorbis, MP3, FLAC, WavPack, WAVE, AIFF, and a few other file formats. Playback is possible through sndio, PulseAudio, ALSA, OSS, Sun audio, and libao.
Display of network protocol headers in a uniform RFC-like format.
A dynamic stylesheet language.