WebWebX is a collaboration server (or whiteboard), a CGI application which provides a means for a group of persons to create and maintain a set of hyperlinked pages via the World Wide Web with all page editing and system management embedded within the application. WebWebX is unique in that it's an all-Perl application, needing only a basic Web server and Perl to operate.
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.
Mohawk is the next-generation, evolutionary leap from TkApache. It is a full-blown front-end GUI for the Apache Web server for configuration, tuning, performance monitoring, and more. Completely re- written in C, using GTK+/GNOME rather than Perl/Tk, Mohawk aims to be faster and more robust than TkApache.