Ogg Vorbis is at http://www.xiph.org/ogg/vorbis/
They have reference encoders, also Winamp and XMMS plugins. They're at Beta 4, with 1.0 coming soon.
The best cross-comparative study is probably to be found at http://ekei.com/audio/
It compares wma, mp3, mp+, ra-g2, ogg, vqf, and mov. (I know of absolutely no one who stores their music as mov, but obviously the guy doing the study does.) His basic conclusion is that ogg is competitive with any other codec qualitywise, but needs improvements in reducing filesize. The recently released RC1 has addressed these concerns, and 1.0 will be competitive with any other codec both qualitywise and sizewise.
They have reference encoders, also Winamp and XMMS plugins. They're at Beta 4, with 1.0 coming soon.
The best cross-comparative study is probably to be found at http://ekei.com/audio/
It compares wma, mp3, mp+, ra-g2, ogg, vqf, and mov. (I know of absolutely no one who stores their music as mov, but obviously the guy doing the study does.) His basic conclusion is that ogg is competitive with any other codec qualitywise, but needs improvements in reducing filesize. The recently released RC1 has addressed these concerns, and 1.0 will be competitive with any other codec both qualitywise and sizewise.