Torque Integrated Development Environment (TIDE) is a free, cross-platform IDE for Torque Game Engine scripting by Paul Dana and Stefan Moises.
It is implemented in Java as a "plugin suite" for the jEdit text editor and contains plugins for function browsing, script debugging, etc.

It can be used for Torque script files as well as Tribes/Tribes2 game scripts...
The plugins are in alpha state and usable but will hopefully be extended and improved by a larger community.
 
TIDE currently requires JEdit 4.2 (JEdit 4.3 alpha/beta is NOT tested/supported yet!), Java >= 1.4 and runs on MacOS X, OS/2, Unix, VMS and Windows.