Weapons
Tribes
As stated before, the Disc Launcher / Spinfusor from Tribes is great, but really any weapon that is projectile based with similar speed and damage can provide the same type of satisfaction. Leading a target and landing those MA's is a great feeling.
The Mortar. I'm not really sure how or even if this type of weapon can fit into Telos, since it seems we're mainly dealing with smaller enclosed maps. The areas where you're out in the open and zero G, I can't really see a Mortar doing much (since it'd technically just travel in a straight line and no arc).
Mines. Good for protecting the flag, as well as placing on common routes the enemy may take. Plus, who doesn't love mine-discing (hella OP)?
Legions
I grew to really enjoy using the Skybolt, which was essentially a very weak Rocket/Disclauncher with a high rate of fire. I think it took about 3-4 direct hits to kill a Light.
The Chaingun was actually fairly unique in Legions. The longer you held down fire the more spread you would have, and eventually it'd overheat and stop firing for a few seconds while it cooled down. However if you were moving faster (chasing for instance), it would keep the spread lower and also increase the amount of time it took to overheat (you were essentially cooling the weapon by moving faster).
The Blaster was also interesting in that besides direct-hit damage, there was also a damage over time effect. Splash damage also had DOT. Good for close quarter battles.
Laser Rifle. I'll just say right now that I hate any kind of sniper in Tribes / Tribes-like. I hated it in Legions, but they did a few things I thought were okay. For starters, you hard to charge it up. Once charged, a beam was visible wherever you pointed, notifying anyone you're looking at. It also cost energy to fire, along with having ammo count. Still, I'd much rather see something like the Skybolt replace the sniper. But if a sniper must be present, the ideas above were decent in Legions.
Boost Grenades. These were grenades that you shot shortly after being thrown, and would give you a nice speed boost. They didn't do very much damage to other players, and were generally considered more of a utility than weapon. Still, they could be used to disrupt player regen so they had several uses.
Halo
Well, if we're being honest I loved the Pistol in Halo 1. That thing was powerful as hell, even from a distance.
Battle Rifle. Burst rifles are actually okay to me. The BR from Halo, LR from Ascend, and R36 from Firefall. All performed their tasks well in my opinion (all were projective-based as well....I think).
Items/Packs/Cores
Tribes
I'm hesitant to venture away from base Tribes, however PrettzL brought up a similar item I've recently grown to like from the Annihilation mod in Tribes 1. It's essentially the Translocator, though without teleport gibbing. If you looked directly at a player and activated your Phase Shift pack, you'd swap places with them. Otherwise, if you were simply looking at a distant hill you'd teleport there like normal. You couldn't tele to an enemy flag stand, though you could grab flags while equipped with it. I'm pretty much a dick with this thing, as I like standing in front of a bunch of turrets, then swapping places with an enemy. They just instantly die from the turrets before they know what's going on.
There's also a Ghost Pack, which allows you to walk through walls at the cost of health. The longer its activated, the more health it drains. One caveat is that it must be a flat / 90º wall. If it's angled, no dice. You could grab flags with it, though there's a random chance you'll drop it (I doubt you like random stuff, though). It's mainly used for infiltrating a base if the usual entrances are heavily guarded.
Your standard Shield pack. Once activated it starts to slowly drain energy. Any damage you receive is absorbed by your energy pool, and once your energy runs out you start taking health damage. I've heard the one in Tribes 2 is terribly OP, so some careful tweaking would need to be done over time if this were added to Telos.
Chameleon Pack. When you activate this pack, you appear as though you're on the other team. It drains energy so it isn't infinite. Your IFF turns green for the enemy, and you're immune to their turrets if they don't have a CAT Sensor deployed. Another good pack for infiltrating a base, though the pack itself gives off a distinct sound when activated that will alert nearby players, so be careful.
Legions
Warp Core. Once activated, you are warped back 3 seconds to your previous location and velocity. It creates a scar in space that others can enter and follow you 'through. The faster you're going prior to activating Warp, the more damage it does to you. If you die upon creating a Warp scar, those who enter also die. You cannot activate Warp while holding onto the flag, however there is a brief delay after you press the key so if you're good enough you can time it so you grab the flag then Warp immediately after. Good for throwing off chasers, though they can of course follow you if they catch the Warp scar in time before it closes.
Regen Core. I mainly like this for its AOE, since healing team mates is nifty (especially your flag carrier). Though I guess a traditional heal/repair gun would also suffice.
