Combat Modules
Brawl Buddy - Boosts damage resistance, Strength and Endurance for 120 seconds when entering combat.
Scope Buddy - Highlights enemies and allows you to target cloaked enemies in VATS.
Reflex Buddy - Slows down time for a few seconds when you're spotted by an enemy.
Recon Modules
Sneak Buddy - Boosts Sneak and grants a stealth field when crouched.
Survival Modules
Nurse Buddy - When your Health drops below 25%, it will slowly regenerate your Health back up to 50%.
Maintenance Modules
Kludge Buddy - Randomly restores some of your weapon's condition when firing.
Juice Buddy - Randomly recharges spent energy cells when firing an energy weapon.
Social Modules
Charm Buddy - Boosts Charisma, Speech and Barter.