LightTPD

Security, speed, compliance, and flexibility–all of these describe LightTPD which is rapidly redefining efficiency of a HTTP webserver; as it is designed and optimized for high performance environments. With a small memory footprint compared to other web-servers, effective management of the cpu-load, and advanced feature set (FastCGI, CGI, Auth, Output-Compression, URL-Rewriting and many more) LightTPD is the perfect solution for every server that is suffering load problems.