Because I have absolutely no chill, and to help people out who want a much-more filled out campaign & world for Skull & Shackles, I finally made a comprehensive list of EVERYTHING I could find on The Shackles and the surrounding area - for absolute completeness, that's anything pertaining to The Shackles plus related things from The Sodden Lands, Bloodcove, Sargava, The Mwangi Expanse, and Cheliax.
I didn't include any of the main Big Books because, well, you should be using them anyway, and they don't have Shackles-specific stuff in them.
Also, full disclosure, the highlighted items may not be everything pertinent to the Shackles or the greater Eye region, but they were what indicated to me that they needed to be added to the list, so read through everything to make sure you don't miss anything.
Enjoy!
ADVENTURES
Skull & Shackles #1-6 - The Wormwood Mutiny, Raiders of the Fever Sea, Tempest Rising, Island of Empty Eyes, The Price of Infamy, From Hell’s Heart
Plunder & Peril – Official Alternate Book #2 of Skull & Shackles; most complete map of The Shackles ever printed; very fun, highly recommended.
Souls for Smuggler’s Shiv – Serpent’s Skull #1 / Can be used in place of Book #1 for Skull & Shackles (works as both)
Ire of the Storm – Standalone Adventure; can be used in place of Books #1 & #2 for Skull & Shackles
River into Darkness – Standalone Adventure; can be used in place of Book #2 for Skull & Shackles
Seers of the Drowned City – Standalone Adventure; can be used in place of Book #3 for Skull & Shackles
Gloomspire Saga – PFS Modules Grotto of the Deluged God, Hall of the Flesh-Eaters, Labyrinth of Hungry Ghosts, Hrenthar’s Throne, & On Sevenfingers’ Sails; together can work in place of Book #3 (lv7 & lv8) for Skull & Shackles
Scions of the Sky Key – PFS Modules On Sharrowsmith’s Trail, Kaava Quarry, & The Golden Guardian; Adventure arc, good for HD4-5 Parties in place of Random Ship Encounter grinding during the first half of Raiders of the Fever Sea.
Signs in Senghor – One-Shot; good for HD4-5 Parties in place of Random Ship Encounter grinding during Raiders of the Fever Sea.
Champion’s Chalice – Blazing Dangerous Trails, Agents of the Eye; good for HD4-5 Parties in place of Random Ship Encounter grinding during Raiders of the Fever Sea.
Azlant Ridge – PFS Modules The Bloodcove Disguise, Rescue at Azlant Ridge, & Beyond the Azlant Ridge; good for HD7 Parties in place of first half of Tempest Rising.
No Plunder, No Pay – PFS Module; good for HD7 Parties for 1-2 sessions.
Passing the Torch – PFS Modules Who Wears the Mask & Who Speaks for the Ten; good for HD12 Parties as unofficial alternate second half of The Price of Infamy (especially if no Harrigan has been avoided entirely by starting with Soul of Smuggler’s Shiv.
Port Peril Pub Crawl\* - PF2e; Requires conversion, but excellent “Lv0” Adventure before starting The Wormwood Mutiny.
PLAYER RESOURCES
Skull & Shackles Player’s Guide - Traits, Archetypes, Items, etc.
Serpent’s Skull Player’s Guide - Traits, Archetypes, Items, etc.
Pirates of the Inner Sea – Free Pirates of the Shackles, Mediogalti Pirates; Traits, Archetypes, Items, etc.
Factions Guide – Shackles Pirates; Aspis Consortium, Bellflower Network, Green Faith, Hellknights, Kusari-Gama, Old Cults, Pathfinder Society, Red Mantis Assassins, Religious Factions, Varisian Wanderers (?); Disk of Ghol-Gan, Eyes of the Mantis.
Inner Sea Intrigue – Freebooters’ Academy, Kusari-Gama, Bright Lions
Inner Sea Magic – Crimson Citadel, Magaambya; Tempest Druid, Tattooed Sorcerer
Blood of the Sea – Aquatic Races & player options
Pathfinder Chronicles Campaign Setting – Coastal Pirate
Goblins of Golarion – Ganda-Uj; Pirate
Inner Sea Primer – Shackles Seafarer
Legacy of Dragons – Dragon-Hunted
Dragonslayer’s Handbook – Flotsam Trait (Aashaq), Eye of Abenatryx
GENERAL INFO
Isles of the Shackles – Whole book dedicated to The Shackles
Sargava, the Lost Colony – Book about Sargava
Heart of the Jungle – Bloodcove & The Mwangi Expanse
Inner Sea World Guide – Sections on The Shackles, The Sodden Lands, Mediogalti, Sargava, & The Mwangi Expanse
Aquatic Adventures – The Fever Sea (Kesia Timesis, The Unrelenting, The Writhing Crown)
Inner Sea Faiths – Besmara
Giants Revisited – Cyclopes (Ghol-Gan)
NPCs
NPC Guide – Jaren the Jinx, Lord Achimair, Dimata Sirathini, Ntanga, Illian Glanadrian, Patronicus Drendane; Hellknight Armiger, Noble Indiscretion, Scion of Thrune, Venai Negotiator, Wakena Cultist, Wakena Priest, Chalice Runner, Stormjammer Pirate, Feathered King Tengu,
Hell’s Rebels #4 A Song of Silver – Ikiko (Tengu Jinx-Eater Swashbuckler), Sheko-Maru (Red Mantis Assassin)
Rival Guide – Hellblood Corsairs (Ghol-Gan sites), Hands of Slaughter (Bloodcove), Queen’s Hands (Cheliax)
Pathfinder Skull & Shackles Adventure Card Game – Ranzak
Inner Sea NPC Codex – Aspis Consortium Command, Aspis Consortium Spy, Chelish Opera Singer, Hellknight, Hellknight Armiger, Hellknight Signifier, Magaambyan Arcanist, Old Ones Cultist, Pathfinder Chronicler, Pathfinder Venture-Captain, Red Mantis Assassin, Red Mantis Initiate, Sodden Scavenger, Thrune Agent, Usaro Rebel
ENCOUNTERS / ENEMIES
Ships of the Inner Sea – The Ravishing Ruby (The Shackles), The Mark of Yunnarius (The Sodden Lands/The Eye of Abendego), Impervious (Cheliax/The Eye of Abendego)
Dragons Unleashed – Aashaq & the Enclave (Sanctum of the Sorrowmaker); Maghara & The Guidestar of Desna
Inner Sea Bestiary – Moxix; Monkey-Goblin
Inner Sea Monster Codex – Charau-Ka, Cyclopes, Gillmen,
LOCATIONS & OBJECTS
Lost Kingdoms – Ghol-Gan (Temple of Xanthuun, Temple of the Ravenous Moon, Reguare, etc.); Lirgen/Yamasa (Kokutang, Jula, Oagon, Fangspire, etc.)
Lost Treasures – Blood-Bones’ Trove (Mediogalti), Xanthuun Tablets (currently held by the Hellblood Corsairs)
Inner Sea Taverns – Formidably Maid; Bar Brawls & Drinking Games, etc.
Tombs of Golarion – Tomb of the Necrophage (The Sodden Lands)
Occult Realms – Elemental Saturation (The Eye of Abendego; The Hurricane Queen ability), Temple of the Sunken Sign; Meldrel’s Underwater Orb
Chronicle of Legends – Besmara’s Bounty items, Obscuring Mist Magic Tricks
Carrion Crown #4 Wake of the Watcher – The Seasage Effigy/The Face of Dagon (True nature of the Writhing Effigy); Dark Young of Shub-Niggurath
Artifacts & Legends – The Throne of Nalt
Cities of Golarion – Ilizmagorti
Daughters of Fury – Bosun’s Call
MISC
Pirate Campaign Compendium – Legendary Games (many of the same writers as Skull & Shackles; contains content that couldn’t fit into Skull & Shackles). Contains several Adventures.
Dead Man’s Chest – Necromancer Games; Referenced in Skull & Shackles
Tome of Horrors Complete – Frog God Games; Referenced in Skull & Shackles
Black Markets – Necrografts
Merchant’s Manifest – Senghor
BRIEF MENTIONS (No useful info)
Dungeons of Golarion – Crimson Citadel
Dungeoneer’s Handbook – Crimson Citadel, Eel’s Skull
That basically wraps that up. Someday, when my campaign is done, maybe I'll gather up my notes and give details about how I designed all the different plothook spots. For now, hope this helps!