"Alexa Internet is one of the oldest and most recognized Web
entities. In addition to providing detailed Web site traffic
information that it collects from users of the Alexa toolbar, Alexa
created the Wayback Machine, an archive of Web site snapshots,
which it donated to the Library of Congress in 1998. Don Whitt,
Alexa's vice president of operations, says Alexa, acquired by
Amazon.com in 1999, has a long history with open source platforms,
including Slackware, FreeBSD, and CentOS.
"When Alexa first launched it ran on a 'hodgepodge' of systems,
like many startups at that time, Whitt says..."