Chuck.lang is a project mainly written in ..., it's free.
gtksourceview syntax highlighting for the Chuck scripting language
XML file defining the syntax for the Chuck scripting language. It's by no means perfect, but it works for me. I'm using it with the gedit text editor.
Find info about Chuck here: http://chuck.cs.princeton.edu/
INSTRUCTIONS
sudo cp ck.lang /usr/share/gtksourceview-2.0/language-specs/
Restart gedit. It should work and automatically recognize *.ck files as ChucK scripts.
I'm using it with Ubuntu 10.04, but it should be fairly similar with other versions of Ubuntu, GTK or even other OSes.
CONTRIBUTING
Feel free to fork, email sugestions and pinpoint bugs :)