writes "On 30 April 1993 CERN published a statement that made World Wide Web ("W3", or simply "the web") technology available on a royalty-free basis. By making the software required to run a web server freely available, along with a basic browser and a library of code, the web was allowed to flourish.
By late 1993 there were over 500 known web servers, and the WWW accounted for 1% of internet traffic, which seemed a lot in those days (the rest was remote access, e-mail and file transfer). Twenty years on, there are an estimated 630 million websites online.
The CERN has a very nice commemoration page."