Complete LitRPGs:

Threadbare series (including Small Medium and Dragon Hack) by Seiple (suggested order: trilogies TB1, SM, DH, TB2)
Limitless Lands by Henegar
Master Hunter K by From Hell
World Tree Online by Hooper
New Game Minus by Lin
Light Online by Larcombe
Eternal Online by Reynolds
Retired S- Rank Adventurer by Wolfe & Falcon
Life Reset by Kuznits
Blessed Time and Viceroy's Pride by Plamann
Towers of Heaven by Milan
CivCEO by Karevik
Forever Fantasy Online by Aaron and Bach
This Trilogy is Broken (a.k.a. This Quest is Bullshit! from Royal Road) by Valentine (a.k.a. Nixia)
War Aeternus by Dean
PrimeVerse by Billiau
Everybody Loves Large Chests by Iliev
Somnia Online by Hanna
The Dungeon Alaria by Kern
Rise to Omniscience by Oster
The Idle System by Pegaz
Last Born of Ki'darth by McGowen
Accidental Traveler (two complete trilogies) by Davis
Savage Dominion by Chmilenko & Penman
The Last Warrior of Unigaea and The Feedback Loop by Cooper
Factory of the Gods (a.k.a. Keldora) by Raizman
Nova Online by Knight
Axe Druid by Johns
Tower Climber and Arcane Kingdom Online by Tanner
Emerilia by Chatfield
Euphoria Online by Tucker
Aether Gate Online by Hultberg
Chronicles of Ethan (and standalone sequel Overpowered Howard) by Monk
System Apocalypse™, Adventures on Brad, and Hidden Wishes by Wong
Combat Codes by Darwin is great, but it's /r/ProgressionFantasy
Death's Mantle by Cooper
Space Seasons by Chapman
Heroic Villain, and Bathrobe Knight by Dean
Metagamer Chronicles by Hunter
Fall of the Black Seraph by O'Kelley (a.k.a. The Genesis Game by Locke)
Afterlife Online by Finn
The Iron Teeth by Straughan
Dungeons of Perdition by Basu
Pangea Online by Rowland
The Weaponized by Deckard
Never Die Twice and Kairos by Durand (a.k.a. Void Herald on RR)
Headshot Online by Siege
Trinity of the Kairos by Sinclair
Chronicles of Wycon by Moore
Abduction Cycles by Cressman
They Called Me MAD and The Houndsman by Pal
The Bright Lord by Knowles
Nora Hazard by Corvin
Beast Realms by Jones
Arena Manager by Opo
Frostworld by Peel
Magnus by Prime
Metamorphosis Online by Grey
Alterlife by Moss
Underverse by Cajiao
The Orzare Chronicles by O Toole
Alpha Physics by Kozlowski
Legends of Ascension by Hultberg
Badges of Dorkdom by Hodges
Star Divers by Landry
Legendary Farmer by Elizabeth Oswald
Class Shift by Sean Oswald
Ten Realms by Chatfield
The Weight of it All by Thorn
Phase Shift by Johnson
Voidbringer Campaign by Hall
Sky Realms by Osgood
Cultivator vs. System by Valerios
Uniworld Online and Glendara Awakens by Brooks
Freedom Online by Lingard
Enora Online by Adams
Harbinger by Keene
Bad Luck Charlie (a.k.a. Dragon Mage) by Baron
Apocosmos by Gkirgkiris
Real- Time Starcommander by Gregory
Dungeon Realms by Yang
Death's Favorite Warlock by Dean
The Game of Gods by Kern
Tower Apocalypse by Cassius & Tang
Real- Time Starcommander by Gregory
Hack, Slash & Burn by Herzman
Cowboy Necromancer (some novellas to follow) & Tokens & Towers by Cooper
Apocalypse Gates (and I think other series) by Schinhofen