In the same vein as this thread, I have begun work on XGtE (it needs a bit more work, but it's almost there), and will hopefully continue with other books (SCAG, TCoE).

Xanathar's Guide to Everything

Credits

Introduction

XGtE4Using This Source
XGtE5The Core Rules
The DM Adjudicates the Rules
Ten Rules to Remember

Ch 1: Character Options

XGtE7Subclasses
XGtE8Barbarian
Personal Totems
Tattoos
Superstitions
XGtE9Primal Paths
Path of the Ancestral Guardian
XGtE10Path of the Storm Herald
XGtE11Path of the Zealot
XGtE12Bard
Defining Work
Instrument
Embarrassment
A Bard’s Muse
XGtE14Bard Colleges
College of Glamour
XGtE15College of Swords
XGtE16College of Whispers
XGtE17Cleric
Temple
Keepsake
Secret
XGtE18Divine Domains
Forge Domain
XGtE19Grave Domain
XGtE21Druid
Treasured Item
Guiding Aspect
Mentor
XGtE22Druid Circles
XGtE22Circle of Dreams
XGtE23Circle of the Shepherd
XGtE24Learning Beast Shapes
XGtE27Fighter
Heraldic Sign
Instructor
Signature Style
XGtE28Martial Archetypes
XGtE28Arcane Archer
XGtE30Cavalier
XGtE31Samurai
XGtE32Monk
Monastery
Monastic Icon
Master
XGtE33Monastic Traditions
XGtE33Way of the Drunken Master
XGtE34Way of the Kensei
XGtE35Way of the Sun Soul
XGtE36Paladin
Personal Goal
Symbol
Nemesis
Temptation
XGtE37Sacred Oaths
XGtE37Oath of Conquest
XGtE38Oath of Redemption
XGtE40Ranger
View of the World
Homeland
Sworn Enemy
XGtE41Ranger Archetypes
XGtE41Gloom Stalker
XGtE42Horizon Walker
XGtE43Monster Slayer
XGtE44Rogue
Guilty Pleasure
Adversary
Benefactor
XGtE45Roguish Archetypes
XGtE45Inquisitive
XGtE46Mastermind
XGtE47Scout
XGtE47Swashbuckler
XGtE48Sorcerer
Arcane Origin
Reaction
Supernatural Mark
Sign of Sorcery
XGtE50Sorcerous Origins
XGtE50Divine Soul
XGtE50Shadow Magic
XGtE51Storm Sorcery
XGtE53Warlock
Patron’s Attitude
Special Terms of the Pact
Binding Mark
XGtE54Otherworldly Patrons
XGtE54The Celestial
XGtE55The Hexblade
XGtE56Eldritch Invocations
XGtE58Wizard
Spellbook
Ambition
Eccentricity
XGtE59Arcane Tradition
XGtE59War Magic
XGtE61This Is Your Life
Origins
Parents
Birthplace
Siblings
Family and Friends
XGtE64Personal Decisions
Background
Class Training
XGtE69Life Events
XGtE72Supplemental Tables
XGtE73Racial Feats
Bountiful Luck
Dragon Fear
Dragon Hide
Drow High Magic
Dwarven Fortitude
Elven Accuracy
Fade Away
Fey Teleportation
Flames of Phlegethos
Infernal Constitution
Orcish Fury
Prodigy
Second Chance
Squat Nimbleness
Wood Elf Magic

Ch 2: Dungeon Master's Tools

XGtE77Simultaneous Effects
XGtE77Falling
Rate of Falling
Flying Creatures and Falling
XGtE77Sleep
Waking Someone
XGtE77Sleeping in Armor
XGtE78Going without a Long Rest
XGtE78Adamantine Weapons
XGtE78Tying Knots
XGtE78Tool Proficiencies
Tools and Skills Together
XGtE78Tool Descriptions
XGtE85Spellcasting
Perceiving a Caster at Work
Identifying a Spell
XGtE85Invalid Spell Targets
XGtE86Areas of Effect on a Grid
XGtE88Encounter Building
Step 1: Assess the Characters
Step 2: Choose Encounter Size
Step 3: Determine Numbers and Challenge Ratings
Step 4: Select Monsters
Step 5: Add Flavor
XGtE91Quick Matchups
XGtE92Random Encounters: A World of Possibilities
XGtE92Arctic Encounters
Arctic Encounters (Levels 1–4)
Arctic Encounters (Levels 5–10)
Arctic Encounters (Levels 11–16)
Arctic Encounters (Levels 17–20)
XGtE93Coastal Encounters
Coastal Encounters (Levels 1–4)
Coastal Encounters (Levels 5–10)
Coastal Encounters (Levels 11–16)
Coastal Encounters (Levels 17–20)
XGtE95Desert Encounters
Desert Encounters (Levels 1–4)
Desert Encounters (Levels 5–10)
Desert Encounters (Levels 11–16)
Desert Encounters (Levels 17–20)
XGtE97Forest Encounters
Forest Encounters (Levels 1–4)
Forest Encounters (Levels 5–10)
Forest Encounters (Levels 11–16)
Forest Encounters (Levels 17–20)
XGtE100Grassland Encounters
Grassland Encounters (Levels 1–5)
Grassland Encounters (Levels 6–10)
Grassland Encounters (Levels 11–16)
Grassland Encounters (Levels 17–20)
XGtE101Hill Encounters
Hill Encounters (Levels 1–4)
Hill Encounters (Levels 5–10)
Hill Encounters (Levels 11–16)
Hill Encounters (Levels 17–20)
XGtE104Mountain Encounters
Mountain Encounters (Levels 1–4)
Mountain Encounters (Levels 5–10)
Mountain Encounters (Levels 11–16)
Mountain Encounters (Levels 17–20)
XGtE105Swamp Encounters
Swamp Encounters (Levels 1–4)
Swamp Encounters (Levels 5–10)
Swamp Encounters (Levels 11–20)
XGtE106Underdark Encounters
Underdark Encounters (Levels 1–4)
Underdark Encounters (Levels 5–10)
Underdark Encounters (Levels 11–16)
Underdark Encounters (Levels 17–20)
XGtE109Underwater Encounters
Underwater Encounters (Levels 1–4)
Underwater Encounters (Levels 5–10)
Underwater Encounters (Levels 11–20)
XGtE110Urban Encounters
Urban Encounters (Levels 1–4)
Urban Encounters (Levels 5–10)
Urban Encounters (Levels 11–16)
Urban Encounters (Levels 17–20)
XGtE113Traps Revisited
XGtE113Simple Traps
XGtE115Designing Simple Traps
XGtE118Complex Traps
XGtE121Designing Complex Traps
XGtE123Downtime Revisited
XGtE123Rivals
XGtE125Downtime Activities
XGtE126Buying a Magic Item
XGtE127Carousing
XGtE128Crafting an Item
XGtE130Crime
XGtE130Gambling
XGtE131Pit Fighting
XGtE131Relaxation
XGtE131Religious Service
XGtE132Research
XGtE133Scribing a Spell Scroll
XGtE133Selling a Magic Item
XGtE134Training
XGtE134Work
XGtE135Awarding Magic Items
XGtE136Common Magic Items
XGtEPageNumberItems A - D
XGtEPageNumberItems E - H
XGtEPageNumberItems I - L
XGtEPageNumberItems M - P
XGtEPageNumberItems R - T
XGtEPageNumberItems U - W
XGtE140Magic Item Tables
XGtEPageNumberMinor Items, Common
XGtEPageNumberMinor Items, Uncommon
XGtEPageNumberMinor Items, Rare
XGtEPageNumberMinor Items, Very Rare
XGtEPageNumberMinor Items, Legendary
XGtEPageNumberMajor Items, Uncommon
XGtEPageNumberMajor Items, Rare
XGtEPageNumberMajor Items, Very Rare
XGtEPageNumberMajor Items, Legendary

Ch 3: Spells

XGtE147Spell Lists
Bard Spells
Cleric Spells
Druid Spells
Paladin Spells
Ranger Spells
Sorcerer Spells
Warlock Spells
Wizard Spells
XGtE150Spell Descriptions

App A: Shared Campaigns

XGtE172Designing Adventures
XGtE173Character Creation
XGtE173Variant Rules

App B: Character Names

XGtE175Nonhuman Names
XGtE175Dragonborn
XGtE176Dwarf
XGtE176Elf
XGtE178Gnome
XGtE179Halfling
XGtE179Half-Orc
XGtE180Tiefling
XGtE181Human Names
XGtE181Arabic
XGtE182Celtic
XGtE182Chinese
XGtE183Egyptian
XGtE184English
XGtE185French
XGtE185German
XGtE186Greek
XGtE186Indian
XGtE187Japanese
XGtE188Mesoamerican
XGtE189Niger–Congo
XGtE189Norse
XGtE190Polynesian
XGtE190Roman
XGtE191Slavic
XGtE192Spanish

Placeholder for SCAG

Placeholder for TCoE