Here are all feats and class features that modify Attacks of Opportunity for offensive use. Not included are defensive options against AoOs, which will be a separate handbook.
Discussion thread is
here.
Work in progress as I wanted to get most of it done while I was on a roll, but I expect there will definitely be stuff I missed.
Links to various rules about AoOs:
Attacks of Opportunity SRDRules of the Game: All About Attacks of Opportunity Part 1Rules of the Game: All About Attacks of Opportunity Part 2Regular books:
PHB:
Combat Reflexes: Make an extra number of AoOs per round equal to Dex mod.
Rogue special ability: Opportunist; Make an AoO against an enemy that was just successfully hit by an ally.
Book of Exalted Deeds:
Wrath Domain, page 87. Granted Power: 1/day, make an AoO against an enemy that damages you with a melee attack
Complete Adventurer:
Deft Opportunist (also in Miniatures Handbook)
Expert Tactician Nightsong Enforcer 6: Opportunist
Arrow Mind spell (also in Spell Compendium)
Complete Psionic:
Justice Mantle page 69: Expend psionic focus to make AoO against creature attacking an ally.
Perfect Riposte power page 93 (also in Races of Stone)
Complete Scoundrel:
Savvy Rogue Sudden Draw skill trick
Complete Warrior:
Close Quarters Fighting Defensive Throw (also in Oriental Adventures)
Hold the Line Karmic Strike Exotic Weapon Master: Exotic Reach ability allows AoO against target with cover, but not total cover.
Knight Protector 6 & 9: No Mercy ability grants +1 AoO per round on top of Combat Reflexes
Draconomicon:
Large and in Charge Overhead Thrust Spellcasting Harrier (epic, not the same as Epic Level Handbook version)
Dragon Compendium:
Mercurial Strike Enabled Hand Monk 3: Kol Soo, "Reverse Hand" ability
Drow of the Underdark:
Clever Opportunist Dread Fang of Lolth 7: Opportunist
Exemplars of Evil:
Slippery SkinExpanded Psionics Handbook:
Opportunity Power Stand StillFiendish Codex 2:
Supernatural InstinctsMiniatures Handbook:
Deft Opportunist (also in Complete Adventurer)
Double Hit Sidestep Tactical Soldier 7: Delayed Cleave. 8: Unbalancing Blow. 10: Reciprocal Strike
Player’s Handbook 2:
Active Shield Defense Defensive Sweep Hindering Opportunist Robilar’s Gambit Spectral Skirmisher Stalwart Defense Legion of Sentinels spell Knight 3: Bulwark of Defense, 5: Vigilant Defender
Races of Stone:
Blade Bravo 10: Lethal Riposte
Perfect Riposte power page 164 (also in Complete Psionic)
Races of the Dragon:
Ghostly Tail spellRaces of the Wild:
WolfpackShining South:
Maquar Crusader 4: Defensive Strike
Tome of Battle:
Clarion Commander Evasive Reflexes Stormguard Warrior Warblade 15: Battle Mastery: Int as insight bonus to attack and weapon damage rolls in melee on AoOs.
Defensive Rebuke maneuver Prey on the Weak stance Thicket of Blades stance Rapid Counter maneuver Feigned Opening maneuver Shifting Defense stanceTome of Magic:
Supernatural OpportunistOnline:
Dragon Magazines:
Dragon 340:
Backstab Canny Opportunist Defensive Opportunist Exploit Adjustment Occult Opportunist Opportunistic Tactician Sneak Attack of Opportunity (non-epic, not the same as Epic Level Handbook version)
Two-Weapon Attack of Opportunity Improved Combat Reflexes (non-epic, not the same as Epic Level Handbook version)
Greater Combat Reflexes3.0 stuff
Epic Level Handbook:
Improved Combat Reflexes (epic, not the same as the Dragon 340 version)
Sneak Attack of Opportunity (epic, not the same as Dragon 340 version)
Spell Opportunity Spellcasting Harrier (epic, not the same as Draconomicon version)
Oriental Adventures:
Defensive Throw (also in Complete Warrior)
Grappling BlockPsionics Handbook:
Power Touch (probably updated to Opportunity Power in XPH)
Silver Marches:
Peerless Archer can make ranged AoOs.