psx forum is a state-of-the-art forum system. You can add tags to every thread and rate it up or down. It is easy to install and you can maintain the forum without an admin area.
Javeline PlatForm is an application development framework for building applications that run in Web browsers but look and feel like conventional desktop applications.
A Lisp-like, general-purpose scripting language.
A network access control (NAC) system.