UNSC
Relover: Has the 3 headshot kill
Bazooka: Bigger blast radius than Rockets but long reload time
Scat Gun: Shotgun styled. Weak but it fires repeatedly and and great for close-up combat
Covenant
Covenant Slingshot: Slowest rapid fire than any rifle weapon but powerful headshots
Gas Gun: Creates healing or hurting electrical gas
Hunter Cannon: Torn off from a dead hunter and shoots out powerful plasma shots. A machine gun type of weapon
Needle Bomber: Shoots out a ball then explodes out of needles and needles do a lot of explosive damage
Forerunner
Didact’s Hands: Able to pull in enemies, 1 hit kill melee and laser blast
Sentry Gun: Able to spawn out an sentinel
Flood Reviver: Able to bring dead Spartans into flood forms and attack other Spartans
Blade Arm: Torn off from Promethean Knights. Charges up and then strikes up enemies from far distances
Pulse Rifle: Assault Rife clone but shoots out consecutive shots. Runs out a bit quickly
Forerunner Zapper: Does a lot damage but over heats quickly. Pistol styled weapon