Thief's Challenge
Troy Christensen
Test of the Warlords
Douglas Niles
Test of the Samurai
Rick Swan
Temple, Tower, and Tomb
Unknown
Temple of the Frog
Dave L. Arneson & David J. Ritchie
Temple Of Elemental Evil
Gary Gygax & Frank Mentzer
Temple of Death
David Cook
Tasha’s Cauldron of Everything
Wizards RPG Team
Tantras
Ed Greenwood
Talons of Night
Jenell Jaquays
Tales of the Outer Planes
Tales of the Lance
Tales of Lankhmar
Anthony Pryor
Tales Of Enchantment
Jim Musser
Tales from the Yawning Portal
Taladas The Minotaurs
Collin McComb
Tal'Dorei Campaign Setting
Matt Mercer & James Haeck
Swords of the Undercity
Swords of the Iron Legion
Swords of the Daimyo
Swords of Deceit
Stephen Bourne & Michael S. Dobson & Ken Rolston & Steve Mecca
The Sword of the Dales
The Sword Of Roele
Sword Coast Adventurer's Guide
Sword and Shield
John Terra
Sword and Fist: A Guidebook to Fighters and Monks
Jason Carl
Swamplight
Jean Rabe
The Sunless Citadel
Bruce R. Cordell
Strongholds & Followers
Matt Colville & MCDM
Strongholds
Stronghold Builder's Guidebook
Matt Forbeck & David Noonan
Strixhaven: A Curriculum of Chaos
Stormwrack: Mastering the Perils of Wind and Wave
Richard Baker & Joseph D. Carriker & Jennifer Clarke-Wilkes
Storm Riders
Troy Denning
Storm King's Thunder
Stibbles' Codex of Companions
Logan Reese
Steading of the Hill Giant Chief
Gary Gygax
Stardock
Steven E. Schend
The Star Cairns
Sean Reynolds
The Standing Stone: An Adventure for 7th-Level Characters
John D. Rateliff
Spelljammer: Adventures in Space
Spelljammer Appendix II (1991)
Spelljammer Appendix I (1990)
Spellbound
Spell Compendium
Matthew Sernett & Jeff Grubb
The Speaker in Dreams
James Wyatt
Sons of Azca
John Nephew
Song and Silence: A Guidebook to Bards and Rogues
David Noonan
Sly Flourish's The Lazy DM's Companion
Michael E. Shea
Sly Flourish's Return of the Lazy Dungeon Master
Sly Flourish's Fantastic Locations
Michael Shea & Brian Patterson & Scott Fitzgerald Gray & Erik Nowak
Sly Flourish's Fantastic Adventures
The Slaying Stone: Adventure HS1 for 4th Edition D&D
Logan Bonner
Slayers of Lankhmar
Dale 'Slade' Henson
Slavers
Sean Reynolds & Chris Pramas
Slave Tribes
Bill Slavicsek
Slave Pits of the Undercity
Skullport
Joseph C. Wolf
Skarda's Mirror
Aaron Allston
Sinister Secret of Saltmarsh
Dave J. Browne & Don Turnbull