The Xiph.Org Foundation is a non-profit organization dedicated to producing public domain multimedia formats and tools. Their primary focus is on the Ogg family of formats, the most successful of which has been Ogg Vorbis, an open and patent-free audio format and codec designed to compete with the patented MP3 and AAC. Current development work is focusing on Ogg Theora, an open and patent-free video format and codec designed to compete with the patented MPEG-4, RealVideo, and Windows Media Video.
In addition to its in-house development work, the Foundation has also brought several already-existing but complementary free software projects under its aegis, most of which have a separate, active group of developers. Among these are Speex, an audio codec designed for speech, and FLAC, a lossless audio codec.