I think open source software is the current pinnacle of human achievement.

Millions of man hours of remote, global collaboration and development to create an enterprise scale software stack containing implementations of all significant (and not so significant) application types and it's free for anyone in the world to use and learn from.

Amazing technological breakthroughs are being made all the time and very, very many of them (The Internet for example) have been made possible through the availability of free, high quality software.