Ciano
Ciano is a free and open source simple multimedia converter for Linux
MystiQ
MystiQ is a free and open source powerful audio and video converter, graphical interface for FFmpeg
Curlew
Curlew is a free and open source easy-to-use audio and video converter for Linux
traGtor
traGtor – free and open source audio and video file converter, GUI for FFmpeg
Asunder
Asunder – free and open source graphical audio CD ripper and encoder for Linux
FFaudioConverter
FFaudioConverter – free and open source batch audio converter and effects processor
fre:ac
fre:ac is a free and open source, multi-platform audio converter and CD ripper with an integrated tag editor
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