Whats Legal by categories of decreasing acceptability:
Core
PHB
DMG
MM
Accessible for free
SRD
Web Enhancements (I count atleast 43 seperate, useful WotC pages)
Generic 3.5 Supplements
BoED
BoVD
CAd
CAr
CC
CD
Ci
CM
CP
CS
CW
DM
DMC
DMG2
DotU
Dr
Du
EE
ELH
EoE
EPH
FCI
FCII
FF
Fr
HoB
HoH
LM
LoM
MH
MIC
MM2
MM3
MM4
MM5
MoI
PH2
RC
RoD
RoS
RotD
RotW
Sa
Sto
ToB
ToM
UA
WoL
Note: Several of the books from series. If the series isnt listed consecutively, it is marked.
Generic Unupdated 3.0 Supplements
AEG
DD
DotF
EA
MotP
MotW
PlH
SBG
SF
SS
TB
Adventure Specific
AEoS
BoBS
BofFK
CoP
CotSQ
CTotW
DH
EH
EotLQ
EtCR
EttDP
EttRoG
EtU
FaT (living greyhawk)
FLDG
FLFotD
FLHP
FLTFoR
FLtFR
FoF
FotY
FoW
GotEC
HoNS
LotIF
MotM
Mys
RHoD
RttToEE
SaS
SC
SGoS
SiD
SiS
SoG
SotHH
SotLW
SSL
StS
TT
VotGD
WotVB
Campaign Specific
CoSW
CoR
CoV
DCS
DoE
DoF
Dra
ECS
FN
FP
FoE
FRCS
Gh
LEoF
LoD
MoE
MoF
Mon
OA
PGtE
PGtF
PoF
RoE
RoF
Sh
ShS
SK
SM
SoS
SoX
UE
Und
Licensed
Dragon Magazine issues 269-308 (3.0), 309-360 (3.5)
Dungeon Magazine issues 90-154?
Licensed and Campaign Specific
AoM
BoK(R)
Diablo II Diablerie
Diablo II To Hell and Back
DoK
HOotS
KoD (simple adventure)
KOoA
LotT
RoA
SoSs (simple adventure)
ToHS
WotL
Not Legal:
Lapsed Liscenses and Campaign Specific
Kingdoms of Kalamar books
Ravenloft Campaign Setting books
Never was legal (aka 3rd party)
Hyperconscious (actually good)
Book of Feats (example of laughable balance)
Homebrew (aka everything else. Even I made a base and prestige class. GitP has a few good ones)
Arbitrary Campaign Coloring:
Rokugan (spelling?)
Manifest
Dragonlance
Eberron
Faerun
My acronyms are WotCs (Magic of Faerun vs Monsters of Faerun) but longer for ease of looking up:
AEG Arms and Equipment Guide
AEoS Anauroch: The Empire of Shade
AoM Age of Mortals
BoBS Bastion of Broken Souls
BoED Book of Exalted Deeds
BoK Bestiary of Kyrnn
BotFK Barrow of the Forgotten King
BoVD Book of Vile Darkness
CAd Complete Adventurer
CAr Complete Arcane
CC Complete Champion
CD Complete Divine
Ci Cityscape
CM Complete Mage
CTotW Cormyr: The Tearing of the Weave
CoP City of Peril
CoR Champions of Ruin
CoSW City of Splendors: Waterdeep
CotSQ City of the Spider Queen
CoV Champions of Valor
CP Complete Psionic
CS Complete Scoundrel
CW Complete Warrior
DCS Dragonlance Campaign Setting
DD Deities and Demigods
DH Deep Horizon
DM Dragon Magic
DMC Dragon Magazine Compendium
DMG Dungeon Masters Guide v.3.5
DMG2 Dungeon Masters Guide II
DoE Dragons of Eberron
DoF Dragons of Faer�n
DoK Dragons of Krynn
DotF Defenders of the Faith: A Guidebook to Clerics, Paladins
DotU Drow of the Underdark
Dr Draconomicon
Dra Dragonmarked
Du Dungeonscape
EA Enemies and Allies
ECS Eberron Campaign Setting
EE Elder Evils
ELH Epic Level Handbook
EoE Exemplars of Evil
EofLQ Eyes of the Lich Queen
EPH Expanded Psionics Handbook
EtCR Expedition to Castle Ravenloft
EttDP Expedition to the Demonweb Pits
EttRoG Expedition to the Ruins of Greyhawk
EtU Expedition to Undermountain
FCI Fiendish Codex I: Hordes of the Abyss
FCII Fiendish Codex II: Tyrants of the Nine Hells
FF Fiend Folio
FLDG Fantastic Locations: Dragondown Grotto
FLFoR Fantastic Locations: Fields of Ruin
FLFotD Fantastic Locations: Fane of the Drow
FLHP Fantastic Locations: Hellspike Prison
FLtFR Fantastic Locations: The Frostfell Rift
FN Five Nations
FoE Faiths of Eberron
FoF Forge of Fury, The
FotY Fortress of the Yuan-Ti
FoW Forge of War, The
FP Faiths & Pantheons
Fr Frostburn
FRCS Forgotten Realms Campaign Setting
Gh Ghostwalk
GotEC Grasp of the Emerald Claw
HoB Heroes of Battle
HoH Heroes of Horror
HoNS Heart of Nightfang Spire
HOotS Holy Orders Of The Stars
KoD Key Of Destiny
KOoA Knightly Orders Of Ansalon.pdf
LEoF Lost Empires of Faer�n
LM Libris Mortis: The Book of the Dead
LoD Lords of Darkness
LoM Lords of Madness
LotIF Lord of the Iron Fortress
LotT Legends Of The Twins.pdf
MH Miniatures Handbook
MIC Magic Item Compendium
MM Monster Manual v.3.5
MM2 Monster Manual II
MM3 Monster Manual III
MM4 Monster Manual IV
MM5 Monster Manual V
MoE Magic of Eberron
MoF Magic of Faer�n
MoI Magic of Incarnum
Mon Monster Compendium: Monsters of Faer�n
MotM Mysteries of the Moonsea
MotP Manual of the Planes
MotW Masters of the Wild: Guidebook to Barbarians, Druids, Rangers
OA Oriental Adventures
PGtE Players Guide to Eberron
PGtF Players Guide to Faer�n
PH2 Players Handbook II
PHB Players Handbook v.3.5
PlH Planar Handbook
PoF Power of Faer�n
RC Rules Compendium
RHoD Red Hand of Doom
RoA Races of Ansalon
RoD Races of Destiny
RoE Races of Eberron
RoF Races of Faer�n
RoS Races of Stone
RotD Races of the Dragon
RotW Races of the Wild
RttToEE Return to the Temple of Elemental Evil
Sa Sandstorm
SaS Song and Silence: A Guidebook to Bards and Rogues
SBG Stronghold Builders Guidebook
SC Sunless Citadel, The
SF Sword and Fist: A Guidebook to Monks and Fighters
SGoS The Shattered Gates of Slaughtergarde
Sh Sharn: City of Towers
ShS Shining South
SiD Speaker in Dreams, The
SiS Sinister Spire, The
SK Serpent Kingdoms
SM Silver Marches
SoG Sons of Gruumsh
SoS Secrets of Sarlona
SoSs Spectre Of Sorrows.pdf
SotHH Scourge of the Howling Horde
SotLW Shadows of the Last War
SoX Secrets of Xendrik
SS Savage Species
SSL Shadowdale: The Scouring of the Land
Sto Stormwrack
StS Standing Stone, The
TB Tome and Blood: A Guidebook to Wizards and Sorcerers
ToB Tome of Battle: The Book of Nine Swords
ToHS Towers Of High Sorcery.pdf
ToM Tome of Magic
TT The Twilight Tomb
UA Unearthed Arcana
UE Unapproachable East
Und Underdark
VotGD Voyage of the Golden Dragon
WoL Weapons of Legacy
WotL War Of The Lance.pdf
WotVB Whispers of the Vampires Blade
Note: I have excluded books like Diablo II Campaign Setting that have no unique crunch unless they also had large adventures in them. Full listing here:
Book of Challenges: Dungeon Rooms, Puzzles, and Traps
Barrow of the Forgotten King
City of the Spider Queen
Cormyr: The Tearing of the Weave
D&D Gazetteer
Deep Horizon
Enemies and Allies (good for laughing at default characters though)
Explorers Handbook
Fantastic Locations: Dragondown Grotto
Fantastic Locations: Fane of the Drow
Fantastic Locations: Fields of Ruin
Fantastic Locations: The Frostfell Rift
Forge of Fury, The
Grasp of the Emerald Claw
Hero Builders Guidebook
Heart of Nightfang Spire
Lord of the Iron Fortress
Mysteries of the Moonsea
Power of Faer�n
Red Hand of Doom
Stronghold Builders Guidebook
Speaker in Dreams, The
Sons of Gruumsh
Shadows of the Last War
Standing Stone, The
Shadowdale: The Scouring of the Land
The Shattered Gates of Slaughtergarde
Sunless Citadel, The
The Twilight Tomb
Voyage of the Golden Dragon
Whispers of the Vampires Blade
Epic Insights Compilation
Fright at Tristor
Map Folio I
Living Greyhawk Gazetteer