nginx - A high performance free open source web server powering busiest sites on the Internet.
OctoSearch - Search the repositories starred by your following on GitHub
lighttpd - A secure, fast, compliant, and very flexible web-server that has been optimized for high-performance environments
GitHub Visualizer - Enter user/repo and see the project visually
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
Gource - Gource is a software version control visualization tool.