Metamorphosite
Metamorphosite is a living site that houses a bunch of articles I've written and changes for every new visitor. The goal is to determine the optimal layout to increase time spent on site. The site adapts its layout based on an aggregate of unique user attributes continually moving toward an optimal design.
I wrote the entire site from scratch. Check out the independent variable results!
Nginx
nginx is a lightweight, high-performance Web server/reverse proxy and e-mail (IMAP/POP3) proxy, licensed under a BSD-like license. It runs on UNIX, GNU/Linux, BSD variants, Mac OS X, Solaris, and Microsoft Windows. Nginx powers 20-26% of all websites commonly surveyed, including most of the high-traffic sites.