Curlew é um conversor multimídia fácil de usar, gratuito e de código aberto para Linux.
MystiQ
Fácil de usar e elegante conversor multimídia.
Sound Konverter
soundKonverter is a frontend to various audio converters.
Carne morta
DeaDBeeF lets you play variety of audio formats, convert between them, customize the UI almost any way you want, and use many additional plugins which can extend it even more.
Ciano
The ciano is a multimedia converter for all the format you need.