Brian Behlendorf was a primary developer of the Apache Web server and a founding member of the Apache Group, which later became the Apache Software Foundation. I frequently mention Apache in my interviews on Free and Open Source Software: while it runs 70% of the world's web servers, while all the code is available to look at/modify, and while it will run on virtually any PC that a school has sitting around, Apache is virtually untaught in K-12 schools in this country. (I have yet to get a good answer as to why this is true. I have the feeling that because there is no marketing money taking Apache to the ed tech shows, most technology teachers don't even consider it.)
The theme for me continues to be Free and Open Source Software (FLOSS) as education--the ability to provide learning opportunities for students by working on and with FLOSS. Programs like OpenOffice, Audacity, and Firefox are great for use in education, but for teaching programming it is rare to find educators using FLOSS programs like Linux, Apache, PHP, or Python--all of which would pretty much guarantee not only a great learning experience, but even job opportunities (heaven forbid).
Great interview with a modest man who helped to create our experience with the Web.