Simplified Alternate History Iceberg
Here's a compilation of every single popular alternate history timeline to date

Tip of the Iceberg
Anastasia
11/22/63
Kaisereich: Legacy of the Veltkrieg
Southern Victory
World War
Road to the Multiverse
Wolfenstein Series
Watchmen
The Gate of Time
Homefront
The Surface
The Peshawar Lancers
Assassins' Creed Series
Ill Bethasad
The Drakia
Ruled Britannia
Himler's War
World of Conflict
Battle Royale
Back to the Pilot
The Boys
Greatest Christmas Story Never Told
Fire on the Mountain
Below the Surface
Decisive Darkness
Red Flood
Back in the USSA
The Mirage
Lion's Blood
The Sky People
If Israel Lost the War
Player 2 Start
Bring the Jubilee
Iron Harvest
Yesterday
Agent of Byzantium
The Shallowly Waters
A Giant Sucking Sound
Reds
Blue Skies in Camelot
Atlantis
Roma Eterna
Hakoi Ichiu
Island in the Sea of Time
The Alteration
As One Star Sets, Another Rises
Frostpunk
Our Struggle
Disunited States of America
Bottom of the Iceberg
Eyes Turned Skyward
Red Alert
West of Eden
Male Rising
The Chaos Timeline
Moonlight in a Jar
Civilization Series
A Hippie in the House of Mouse
1862
The Belasarus Series
The Gate of Worlds
Ohga Shrugs
The Abyss
1901
The Guns of the South
A World of Difference
The Neanderthal Parallax
Red World
Fear Loathing & Gumbo on the Campaign Trail 72
Crimson Skies
The Place Promised in our Early Days
Beyond the Abyss
A Different Flesh
Xavras Wyzrin
A Conneticut Yankee in Arthur's Court
Lands of Red & Gold
Green Antarctica
New Deal Order Coalition Retained
No W
The Atlantropa Articles
The Ocean Floors
The Difference Engine
A World of Laughter, A World of Tears
A Scotsman in Egypt
July's People
The Selma Massacare
No Spanish Civil War
Ab Urbe Condita Libri
The North Star is Red
Delenda Est
Crisis of the Kremlin
It Happened Here
A Golden Island to the West