fre:ac is a free audio converter and CD ripper for various formats and encoders. It features MP3, MP4/M4A, WMA, Ogg Vorbis, FLAC, AAC, and Bonk format support, integrates freedb/CDDB, CDText and ID3v2 tagging and is available in several languages.
I tried it on AMD 5200+ dual core HP PC. Converting audio with this is the only time my CPU core exceeded 80 degrees c. Never heard my fans get this loud before. Would be nice if there was a setting to reduce priority or CPU usage.
It seemed to work super-smoothly for the first use, but I walked away after five minutes and it crashed. Maybe it's only 1.0.14, but I don't recommend this version.
Crash after crash after crash with version 1.0.14