Ogg Vorbis is a completely open, patent-free, professional audio encoding format , with streaming technology with all the benefits of Open Source.
The Ogg Vorbis format is intended for unrestricted private and public, non-profit and commercial use. There are no bitstream royalties and the reference software, including full source, is free forever. The encoders, decoders, plug-ins, and tools, which you can find here and at are under the GPL (GNU Public License) and the libraries are under the business-friendly LGPL (Lesser/Library GNU Public License).
Ogg Vorbis does not compromise quality for freedom. Its stunning quality is coupled with aggressive features like fast bitrate scaling, surround channels, and fast sample-granularity seek and decode. The development libraries offer full encoding, decoding, and streaming capability for Windows, Linux/*BSD, Solaris, MacOS, and BeOS.
Please download the tools and plugins in order to try Ogg Vorbis out for yourself. Developers and technology partners may wish to visit the Ogg Vorbis developer's section for source, documentation, and access to the Ogg developer community.