Hiawatha is an open source webserver with security, easy to use and lightweight as the three key features. Hiawatha supports among others (Fast)CGI, IPv6, URL rewriting and reverse proxy. It has security features no other webserver has, like blocking SQL injections, XSS and CSRF attacks and exploit attempts. The built-in monitoring tool makes it perfect for large scale deployments.
Hiawatha project website: https://www.hiawatha-webserver.org/