Warframe Mods (mods marked with * have Primed versions)
Warframe Auras
1a: Corrosive Projection, Energy Siphon.
1b: Rifle Amp, Steel Charge.
1c: Loot Detector, Enemy Radar, Shield Disruption, Rejuventation.
Warframe Mods
1a: Redirection, Vitality, Streamline, Continuity*, Intensify
1b: Flow*, Constitution, Narrow Minded, Fleeting Expertise, Overextended, Transient Fortitude, Blind Rage.
1c: Vigor, Stretch, Equilibrium, Rage, Quick Thinking, Natural Talent, Armoured Agility, Steel Fibre.
Exilus Mods
1a: Coaction Drift, Power Drift, Enemy Sense, Aviator
1b: Cunning Drift, Agility Drift, Stealth Drift, Endurance Drift, Firewalker, Thiefs Wit, Intruder
Primary Mods
Rifle Mods
1a: Serration, Split Chamber.
1b: Cyro Rounds*, Hellfire, Infected Clip, Stormbringer.
1c: Hunter Munitions, Point Strike, Vital Sense.
2a: High Voltage, Malignant Force, Rime Rounds, Wildfire.
2b: Hammer Shot, Argon Scope, Bladed Rounds, Vigilante Armaments, Heavy Calibre.
Sniper/Bow Mods
1a: Serration, Split Chamber.
1b: Cyro Rounds*, Hellfire, Infected Clip, Stormbringer.
1c: Point Strike, Vital Sense, Hammer Shot, Argon Scope.
2a: High Voltage, Malignant Force, Rime Rounds, Wildfire.
2b: Speed Trigger, Shred, Vile Acceleration, Critical Delay, Thunderbolt.
Shotgun Mods
1a: Point Blank*, Hell's Chamber.
1b: Contagious Spread, Charged Shell, Incendiary Coat, Chilling Grasp
1c: Blunderbuss, Ravage*, Seeking Fury.
2a: Blaze, Toxic Barrage, Frigid Blast, Scattering Inferno, Shell Shock.
2b: Laser Sight, Shotgun Spazz, Critical Deceleration, Sweeping Serration, Accelerated Blast.
Secondary Mods
1a: Hornet Strike, Barrel Diffusion, Lethal Torrent.
1b: Convulsion, Deep Freeze, Pathogen Rounds, Heated Charge*.
1c: Target Cracker*, Pistol Gambit*.
2a: Frost Bite, Ice Storm, Pistol Pestilence, Scorch.
2b: Hollow Point, Magnum Force, Gunslinger.
Melee Stances
All of them, as each one has specfic weapon types, polarities and playstyles. Find the weapons you like and use the correctly matching stance, it will also increase weapons mod capacity. Generally speaking Rare (gold) stance mods are better than Uncommon (silver).
Melee Mods
1a: Pressure Point*, Berserker.
1b: Fever Strike*, Molten Impact, North Wind, Shocking Touch.
1c: Reach*, Organ Shatter, Spoiled Strike.
2a: Vicious Frost, Virulent Scourge, Voltaic Strike, Volcanic Edge.
2b: Drifting Contact, Weeping Wounds, Body Count, Healing Return.
Maiming (Memeing) Strike is special enough to warrant it's own category. If you can get your hands on it, great -- it's stupidly good. If you can't, or don't want to either wait til it comes around again, or pay the crazy prices players are selling it for it is absolutely fine to NOT use it.