Streamtuner2
Streamtuner2 is a free and open source GUI directory browser for internet radio, audio and video streams
Puddletag
Puddletag is a free and open source, powerful yet simple audio tag editor for Linux
Shutter Encoder
Shutter Encoder is a free and open source video converter, image and audio handles tool
Musictube
Musictube is a free and open source program to listen to music/songs from YouTube
MPlayer
MPlayer – free and open source, cross-platform media player
QMPlay2
QMPlay2 – free and open source, multiplatform video and audio player which can play most formats and codecs
Celluloid
Celluloid – free and open source, simple media player that can play virtually all video and audio formats, GTK+ frontend for mpv
SMPlayer
SMPlayer – free and open source media player with built-in codecs, with support for Youtube for Windows and Linux
Flacon
Flacon extracts individual tracks from one big audio file containing the entire album of music and saves them as separate audio files
Selene
Selene – free and open source audio/video converter for converting files to various formats