NGINX [Engine-X] is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server written by Igor Sysoev. It has been running on many heavily loaded sites, including Facebook, Zappos, Groupon, LivingSocial, Hulu, TechCrunch, Dropbox, Tumblr and WordPress.
lighttpd (pronounced /lighty/) is a secure, fast, compliant, and very flexible web server that has been optimized for high-performance environments. lighttpd uses memory and CPU efficiently and has lower resource use than other popular web servers. Its advanced feature-set (FastCGI, CGI, Auth
... [More], Output-Compression, URL-Rewriting and much more) make lighttpd the perfect web server for all systems, small and large. [Less]
Lightweight HTTP reverse proxy dispatching requests differently based on a hash of the IP address of the client. Either to different upstream servers or by adding tags in the HTTP headers. It is used as a seamless implementation of A/B testing. For instance, the user can simply deploy two versions
... [More] of his/her applications and make 10% of the traffic go to the first and 90% to the latter. [Less]