Someone out there has the Tribes 1 source code. The directory listing/dump has been leaked a couple times but never the full code (last time around the "InstantAction" era). I really, really wish it would be. Right now all the Tribes intellectual property is locked up behind "Hirez Games" and they only make microtransaction/pay2win games. "Tribes 3" the recent release is made by employees of this company unfortunately. Not quite a Tribes game.

T2 would be cool too. But nothing tops T1. That said, there's no reason to wait for the source to be leaked to play. http://playt1.com/ has everything you need. The community maintains both the game client and have written multiple custom master servers.

I loved Tribes! I'd play that after coming home from working on Descent 3. We did some multiplayer at lunch at the office as well.

Tribes 2 would make an awesome modern game for players used to big 32v32 base-centered combat FPSes.

That's EarthSiege universe, eh? I've been working on and off to decompile EarthSiege 2. Might take another stab at it this summer... maybe there are code similarities, I wouldn't be surprised at all.

IIRC Torque3D is based on Tribes 2 but a lot has been replaced over the years.