From Hugo Leisink:
Hiawatha is a secure webserver for Unix in both code and features. Hiawatha can stop SQL injections, XSS and CSRF attacks and exploit attempts. Via a specially crafted monitoring tool, you can keep track of all your webservers.
Hiawatha has an easy to learn configuration syntax. The documentation and examples you can find on its website will give you all the information you need to configure your webserver. Although Hiawatha has everything a modern webserver needs, it's nevertheless a small and lightweight webserver. This makes Hiawatha ideal for older hardware or embedded systems. Special techniques are being used to keep the usage of resources as low as possible.