Potamus 17
Potamus is an audio player, very lightweight and GTK-based, derived from xhippo. It doesn't require a complex database, but just utilizes the filesystem as-is for music collections. It supports MP3, FLAC, Ogg Vorbis, Opus and other ModPlug/FFMpeg/audiofile-supported formats. Potamus supports OSS and ALSA or JACK for playback.