"Yahoo also has a long history of releasing its custom wares as
open source projects.
"In 2009 it released its 'Traffic Server' app and continues to
contribute to it, says Papaioannou. Traffic Server is software
initially acquired via Inktomi, which caches and serves content,
among other features. It open sources a project called S4, for
real-time stream analysis. This tool helps others build their own
and CSS library known as the Yahoo User Interface, or YUI 3."
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