Vitomu
Vitomu is a free and open source, easy-to-use converter of YouTube videos to various audio formats
Shutter Encoder
Shutter Encoder is a free and open source video converter, image and audio handles tool
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
SoundConverter
SoundConverter – free and open source simple, convenient and fast audio file converter for Linux
SoundKonverter
SoundKonverter is a frontend to various audio converters, software for transfer the contents of audio CDs to your PC and convert the contents of music folders