Open Source and the Web

The Web is overwhelmingly open source, as Lotus founder Mitch Kapor states:

The accomplishment of open source is that it is the back end of the Web, the invisible part, the part that you don't see as a user.
All of the servers, pretty much, they run Linux as the operating system; they run Apache as the basic Web server on top of which everything else is built. The main languages out of which Web applications are built - whether it's Perl or Python or PHP or any of the other languages - those are all open source languages. So the infrastructure of the Web is open source ... the

Web as we know it is completely dependent on open source.