Lighttpd is a small webserver and fast webserver developed with security in mind and a lot of features. It has support for * CGI, FastCGI and SSI * virtual hosts * URL rewriting * authentication (plain files, htpasswd, LDAP) * transparent content compression * conditional configuration * HTTP proxying and configuration is straight-forward and easy.
As 'AndrewX192' said, agree + I add it's good for running even Tor hidden services for some small static pages (if you don't want run e.g. pythoned ones ;))