Various cheats  

     Add the command-line parameter "-console" to the shortcut for the
game, then while playing press [TAB] to bring up the console. Type any
of the following codes:

Example: "C:\Program Files\Tribes Vengeance\tribes.exe" -console 

Cheat code:             Result:
god                     God Mode
allammo                 999 Ammo, 99 Grenades
allweapons              All Weapons
stat all                Show All Stats
stat FPS                Show FPS
stat net                Show Network Stats
stat none               Turn Off Stats
fov #                   Field of View (# = 01 to 99)