"The World Wide Web Consortium (W3C) develops interoperable technologies (specifications, guidelines, software, and tools) to lead the Web to its full potential. W3C is a forum for information, commerce, communication, and collective understanding." (from the W3C site).
It "is the main international standards organization for the World Wide Web (W3). It is arranged as a consortium where member organizations maintain full-time staff for the purpose of working together in the development of standards for the W3. ... W3C also engages in education and outreach, develops software and serves as an open forum for discussion about the Web." (Wikipedia)