Pineapple tracker is a tracker that runs in your terminal and has vi-style keyboard commands. It is heavily based on code from lft's hardware chiptune project.
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.
A Scala-based build system.
A language that adds classes, methods, and other object oriented features to C.