Tenjin is a very fast template engine for web applition.
It runs about 3-10 times faster than other template engine.
It is implemented in Python, Ruby, Perl, and JavaScript.
A MUD-Client for Windows (Win32) and KDE, featuring perl, python and ruby scripting, as well as multi-window output. The main focus is a very strong scripting engine (nearly everything is accessible from a script) while trying to stay user friendly.