winLAME - winLAME is an encoder for several audio formats, including mp3 (MPEG Layer 3), Ogg Vorbis and more.
ripperX - RipperX is a GTK program to rip CD audio tracks and encode them to the Ogg, MP3, or FLAC formats.
morituri - morituri is a CD ripper aiming for accuracy over speed.
Asunder - Asunder is a graphical Audio CD ripper and encoder for Linux. You can use it to save tracks from an Audio CD as any of WAV, MP3, OGG, FLAC, Opus, WavPack, Musepack, AAC, and Monkey's Audio files. Asunder is translatable!
Express Rip - Express Rip CD ripper can convert CD audio to mp3 or wav file formats.
Sound Juicer - Sound Juicer is a clean, mean, and lean CD ripper for GNOME 2.