Hiawatha is a secure and advanced Web server for Unix. It has been written with security as its main goal. It features advanced access control, prevention of SQL injection and cross-site scripting, banning of clients who try such exploits, the ability to run CGIs under any UID/GID you want, and many other features. These features make Hiawatha an interesting Web server for those who need more security than what the other available Web servers are offering. Hiawatha is also fast and easy to configure.
Firetable is an IPtables firewall script for Linux. It has no graphical interface, and all the configuration is done via configuration files. This makes Firetable ideal for servers. The syntax of the configuration file is easy to learn and logical. Multiple interfaces can be maintained independently.