Ogg Vorbis

JOrbis
Pure Java Ogg Vorbis decoder, which can be used under the terms of LGPL licence. Feature list, download, and list of applications making use of the software. It also links to other useful Java tools with LGPL license.
http://www.jcraft.com/jorbis

Korbis
Provides information about their CD to Ogg Vorbis converter software which is intended to be used with KDE and linux. The full source code of the project is available on the sourceforge project page.
http://korbis.sourceforge.net/

Ogg Vorbis on Wikipedia
Provides general information about this audio format, its history, related codecs and their comparison, as well as several external links to developer web sites, encoders and decoders and third party softwares.
http://en.wikipedia.org/wiki/Ogg_Vorbis

Ogg Vorbis Tutorial on Angrycoffee.com
A how-to guide about creating and listening to Ogg Vorbis files.
http://www.angrycoffee.com/tutorials/vorbis

Portable Ogg Vorbis Players
The wiki page gathers a list of different types of mobile players known to support Ogg Vorbis audio format. The wiki itself is owned by Xiph.org.
http://wiki.xiph.org/index.php/PortablePlayers

RareWares
Offers audio players and codecs for Ogg Vorbis, MP3 and Mpeg4, AAC and other formats. Comparison of different formats and codecs are also available.
http://www.rarewares.org/ogg.html

SourceForge.net: Ogg Vorbis Player
The aim of the project is to develop and maintain a GTK+ based Ogg Vorbis player uner GPL for linux.
http://www.sourceforge.net/projects/ovplayer

WinVorbis
Offers free tools with a graphical user interface to create and maintain Ogg Vorbis audio files on Windows and Linux operating systems.
http://www.winvorbis.stationplaylist.com

Xiph.org Foundation
Non-profit corporation dedicated to protecting multimedia by developing free and open protocols and software, including the Ogg container format.
http://xiph.org/vorbis/