Each subsection has my favourites near the top, then aren't really in order.
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 (andStreet Cultivation, but it's not a LitRPG) 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 (great series, but very limited progression; max level from the beginning) 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 (NSFW gore, nudity, demons raping each other but asexual protagonist doesn't understand sexuality and is mostly uninvolved) 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 (complete arc; once Dinosaur Dungeon concludes, this series will continue.) 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 Below here I haven't read yet: 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 (I've heard there are lots of sex scenes and he's known for "secret harems")
Standalone LitRPGs:
How to Defeat a Demon King in Ten Easy Steps by Rowe Tales from the Upgrade by Henegar The Card Job by Falbo (I used to also includeThe Crafting of Chess, but it now has a sequel. Regardless, it's already a complete story in 1 volume.) Leveled Up Love by Wong and Marshall Battle Spire by Miller Kaiju: Battlefield Surgeon by Dinniman (trigger warning: gore, abuse of various types) Below here I haven't read yet: Zombie Slayer by Milan Axilon99 by Cox The Ridden by Kern Aether Frontier by McCoskey Royal Bodyguard and Just A Bronze by Richter Hazelhearth Hires Heroes by Willison Nigmus Online by Barnett An Old Man's Journey by Allanther Toothless by Thomas
Sci-Fi LitRPGs:
(this is my attempt to include science fiction stories with LitRPG elements, but that focus on the science-fiction implications of VR/AI/games, not on progression)
Continue Online by Morse Virtual Realities by Schott Puatera Online by Chapman (the first three books have very little /r/ProgressionFantasy elements; later books are a bit more typical of the genre)
Series that can be read as complete with a midway stopping point, but have been continued:
The Gam3 by Yap (a sequel series started in August on RR, but book 3 ends a complete story) Nova Terra by Ring (to be continued inForgemaster)
Series that are on permanent (?) hiatus but at a stopping point that could be an ending:
Desire by Milan (not harem... Really poorly-named series! Milan calls it complete, but it's an open ending.) Monster Hunter NYC by Cooper (harem) Below here I haven't read yet: Greystone Chronicles, Shadow Sun, The Darkelf Chronicles and Mars System Reboot by Willmarth
Dungeon core series:
Elemental Dungeon (a.k.a. Bone Dungeon) by Smidt Dungeon Crafting, Dungeon Fairy, Dungeon World, Station Core, Dungeon of Chance and Holiday Dungeon Core by Brooks Derelict by Henegar (complete trilogy; more books to come) Divine Seed (a.k.a. Tree Dungeon) by Karevik Bio Dungeon by Logue and Brooks Divine Dungeon by Krout (imho stronger as a complete trilogy, but it's also a complete series at five books.) Guild Core by Reynolds Futuristic Dungeon Core by Grant Below here I haven't read yet: A Lonely Dungeon (RR) by cathfach Cat Core and War Core by Henegar Blue Core by InadvisablyCompelled (adult content chapters marked; I assume so they can be skipped)
Complete web serials:
Worth the Candle by Wales The Infinite Labyrinth by Vincent Archer The Humble Life of a Skill Trainer by altonsleet Mother of Learning by nobody103 is amazing, but it's /r/progressionfantasy not LitRPG. Below here I haven't read yet: Vainquer the Dragon by Void Herald Azarinth Healer by Rhaegar (book 1 on KU, epilogue to follow still) Everybody Loves Large Chests by Exterminatus (trigger warning: rapey demon sex, gratuitous gorey violence) (also Small Chests Are Fine Too) more NSFW than KU version? Epilogue by Etzoli Damage=MA: A Rolling Stone LitRPG by zechamp Death Singer by geminirand
Or maybe just peruse COMPLETE-tagged stories on Royal Road.
Russian-translated complete LitRPG series:
Level Up by Sugralinov Dark Herbalist by Atamanov The Way of the Shaman by Mahanenko (ending on book 6) AlterWorld by Rus Below here I haven't read yet: Galactogon by Mahanenko Animus and Chronicles of KieraFreya by Anderle Mirror World by Osadchuk Realm of Arkon by Akella An NPC's Path by Kornev The Neuro by Livadny Clan Dominance by Mikhailov The Final Countdown by Ulengov
Asian translated LitRPGs:
Master Hunter K (on KU) by From Hell Solo Leveling/I Alone Level Up by Sung-Lak Infinite Competitive Dungeon Society and Everyone Else is a Returnee by Toika The Legendary Mechanic by Peija Seoul Station Necromancer by Jin Rebirth of the Thief Who Roamed the World by Mad Snail Reincarnation of the Strongest Sword God by Lucky Old Cat Emperor of Solo Play by D-Dart borderline LitRPG:Throne of Magical Arcana by Cuttlefish That Loves Diving A Returner's Magic Should be Special by So-Nan Below here I haven't read yet: Demon King by Toika Advent of the Archmage by Mo Xiang Night Ranger by Dark Blue Coconut Milk Warlock of the Magus World by The Plagiarist Desolate Era by I Eat Tomatoes The Second Coming of Gluttony by Ro Yu-jin And there are alotof complete translated cultivation web serials; search over at /r/ProgressionFantasy or /r/NovelTranslations for recs. I also expect this list is missing many complete series. Please recommend any you think are worth reading!
#Harem series
World Seed by Miller Reborn by Jackson Reborn as a Baron Lord by Yang Wolf King's Lair by Drake
I'm likely going to GDPR-Nuke my Reddit account, depending on how things shake out by July 1, so not sure how to share this back with /r/LitRPGs. Is it easy to link to here from Reddit? idk