Web games, also known as browser games, are games played over the web. Not to be confused with Freeware Games, which are distributed for free and act like regular computer programs. Web games are played directly through the web browser, often (but not always) with the help of a plugin.

Individual Web Games

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4X Games

Neptune's Pride

Action Games

Games By 53xy83457
Agar.io
Amorphous+
Arkandian Legends
Armed With Wings
Aqua Rhapsody
Boss Rush Apocalypse
Brawlin' Sailor
Candy Mountain Massacre ([adult swim] First-Person Shooter/Third-Person Shooter games)
Commando 2 (Run-and-Gun similar to Metal Slug)
Coinbox Hero
DadGame
Elfland Glider (Web VR)
Forbidden Arms
Garden Gnome Carnage
Get Off My Lawn
Intrusion
KoopaTV series
Lesbian Spider Queens of Mars ([adult swim] games)
Miami Shark
Narwhale.io
Road of the Dead
ROM Check Fail
Sky Serpents
Slay.one
Slither.io
splix.io
TagPro
Viva Caligula ([adult swim] games)
Whack Your...
Wtf The Worst Game Ever
Zlap.io

Action Adventure

Alice In Spaceland Series
Amea
Cyborg
Dungeon Blitz (also a MMORPG)
Emogame
Escape from Puppy Death Factory (also a Metroidvania)
Evoland
The Flowering Nose
Kit and the Octopod
Legend Of Kalevala (also a Metroidvania)
The Legends Of Hiro
Legends Of Kong
Legos In Space
No Time to Explain
Phoenotopia
Seedling
Snailiad (also a Metroidvania)

Adventure Games

Alice Is Dead (Point-and-Click Game, horror)
Ambridge Mansion (Point-and-Click Game, horror)
Arcane Online Mystery Serial (Point-and-Click Game, horror)
Arrival In Hell (Point-and-Click Game, horror)
A Small Favor
Backdoor
Belial (Point-and-Click Game)
Billy's Big Adventure (Choose Your Own Adventure)
Choice of Games (Choose Your Own Adventure)
- Affairs of the Court (Choose Your Own Adventure)
- Heroes Rise (Choose Your Own Adventure)
- Choice of Robots (Choose Your Own Adventure)
Colour My Series
Darkness (Point-and-Click Game, horror)
Daymare Town (Point-and-Click Game)
The Dead Case (Point-and-Click Game, horror)
Deep Sleep Trilogy (Point-and-Click Game, horror)
Detective Grimoire
Die Anstalt
Divine Intervention
Don't Look Back (2014)
Exmortis
Fallen London
Find the Cure!
Franks Adventure
Five Minutes To Kill Yourself
Gretel and Hansel (Point-and-Click Game)
Hewitt (Point-and-Click Game)
How to Raise a Dragon
Jack French (Point-and-Click Game)
Johnny Rocketfingers (Point-and-Click Game)
Kingdom Hearts χ aka Kingdom Hearts χ [chi], prequel to the Kingdom Hearts franchise.
Lakeview Cabin
The Last Door (Point-and-Click Game)
Looming
Lost In Vegas
Medieval Cop (Point-and-Click Game made using RPG Maker)
Morningstar
Myosotis (Point-and-Click Game)
Mystery of Time and Space
Nightmare Doors
Peasant's Quest
Reincarnation
Rubber Dinghy
The Sagittarian (Point-and-Click Game)
Samorost
The Room: The Game
Sissy's Magical Ponycorn Adventure
Steppenwolf: The X-Creatures Project
Story of the Blanks (horror fan-game of My Little Pony: Friendship Is Magic)
Skrillex Quest
Submachine
Thy Dungeonman
Til Cows Tear Us Apart
Trapped Series (Point-and-Click Game with escape-the-room, puzzle and Jigsaw Puzzle Plot elements)
The Trapped Trilogy (Adventure Game with animation and voice acting, distinct from the above series)
- Godlimations
Triachnid
Trisphere
The Several Journeys of Reemus
The Splitting
The Trader of Stories
The Visitor
Tube Adventures (Point-and-Click Game)
Wasted Youth
Which Way Adventure (Point-and-Click Game)
Zero Summer

Card Games

Yu-Gi-Oh! BAM
Unlight

Detective Games

Sleuth

Endless Running Games

Escape the Room

Fighting Games

Beat Em Up

Hidden Object Game

Criminal Case
Gardens of Time

Idle Games

Launcher Games

Multiplayer Online Battle Arena

Platforming Games

Ordinary Platformers

A Koopa's Revenge
Adventure Ponies
The Bright in the Screen (horror)
Cactus McCoy (also a BeatEmUp)
The Caverns Of Hammerfest
Clarence's Big Chance (also a borderline Metroidvania)
Diamond Hollow II
Dino Run
Diseviled
Elephant Quest
The End
Everybody Edits (has some sandbox elements)
Exit Path
Fancy Pants Adventures
Fluunix
Gun Bot
Gyossait (horror)
Heir
Icycle
King's Ascent
Level Up (also a Metroidvania)
Meat Boy
Mibibli's Quest (also a shooter)
Mind Your Manors
Mission In Snowdriftland
Raze2 (has heavy 2d shooter elements).
Perdition
Persist
Plazma Burst Series (has heavy 2d shooter elements).
Remnants Of Skystone (also an MMORPG and a Metroidvania)
Robot Wants Series (also a Metroidvania)
Rokko Chan
Sint Nicolaas
Stinkoman 20X6
STREEMERZ
Strike Force Heroes (has 2D Shooter Elements.)
Summit
Super Chick Sisters
Super Mario 63
Super Mario Bros. Crossover
Tails' Nightmare (horror)
Thing Thing
This Is the Only Level (parody)
Vector
The Visit
You Only Live Once (parody)

Puzzle Platformers

Exploration Platformers

Survival Horror Platformers

SilentHive

Puzzle Games

2048
The 99 Rooms
Alpha Bounce
Ball Revamped
Criminal Case
Doodle God
Factory Idle Missions
Freecell
Gardens of Time
Garfield's Scary Scavenger Hunt
Grow
Guardian Rock
Haunt The House
Hoshi Saga
Help The Hero
Immortal Souls
Lab of the Dead
Mental Series
no-one has to die.
Notpron
Planetarium
Portal: The Flash Version
Pretentious Game
Puzzle Clubhouse
Save Toshi (only the first 40 levels though)
The Very Organized Thief

Quiz Games

Kahoot!

Racing Games

Roguelikes

Dicey Dungeons

Role Playing Games

Action RPGs

Adventure Kingdom
Arcuz
Ginormo Sword
Monster Legends
Super Press Space to Win Action RPG 2009 (parody)
The Haunted Ruins

Eastern RPGs

Crystal Story
The Enchanted Cave and The Enchanted Cave 2
Epic Battle Fantasy
Fantasy Online (Affectionate Parody)
Ge Ne Sis (also a Tactical RPG)
- Wings Of Genesis, its spinoff, which is actually a Horizontal Scrolling Shooter.
Granblue Fantasy
Linear RPG (parody)
MARDEK
Outernauts
Parameters (Deconstruction Game)
Pokémon Black and Blue (parody of Pokémon)
TCT RPG (also known as The Color Tuesday)
Turn Based Battle (parody)

Tactical RPGs

Ge Ne Sis (also an Eastern RPG)
- Wings Of Genesis, its spinoff, which is actually a Horizontal Scrolling Shooter.
Telepath RPG (also a Western RPG)

Western RPGs

Arfenhouse
AdventureQuest
- DragonFable, its prequel.
- MechQuest, DragonFable's prequel.
- WarpForce, expansion to AdventureQuest
Book of Mages: The Dark Times
Candy box!
Castle Age
Dragon Age Journeys
Dragon Tavern
Dream World
Ghost Tales
Gravity Falls: PinesQuest 2Dimensions
Improbable Island
Knights Of The Crystal
A Knight's Quest for Milk
Lost Frontier
Mafia Wars
Marvel: Avengers Alliance
- Marvel Avengers Alliance Tactics, its spinoff (also a Tactical RPG)
NeoQuest
Poptropica
RuneScape
Sinjid
Sonny
Sryth (a text RPG)
Stick RPG
Superhero City
Telepath RPG (also a Tactical RPG)
Twilight Heroes
U Realms Live
Vulpin Adventure
War Metal

Massively Multiplayer Online RPGs

AdventureQuest Worlds
AdventureQuest3D
Alteil
Aola Star
Aoqi Legend
Bit Heroes
Cantr II
Club Penguin
Dark Orbit
Dawn of the Dragons
Dead Frontier
Dealt in Lead
Doom Forge
Drakensang Online
Dungeon Blitz (also an Action-Adventure game)
Evony
Faery Tale Online
Forum Warz
Fusionfall
Gaia Online
Game of Thrones: Ascent
Habbo
Kingdom of Loathing
Legacy of a Thousand Suns
Mabinogi
MMO Asteroids
Moshi Monsters
Muelsfell Rise Of The Golems
Nexus War
The Overseer Project
Pardus
Realm of the Mad God
Remnants Of Skystone (also a Platformer and a Metroidvania)
Shintolin
Skyrates
Star Pirates
Torn City
Urban Dead
Urban Rivals
World Of Dungeons

Rhythm Games

Super Crazy Guitar Maniac Deluxe

Simulation Games

Amateur Surgeon (Meat Grinder Surgery)
Avatar High (life sim)
Big Al Game (life sim)
Cafe Rouge (dating sim/visual novel)
Cooking Mama: Mama Kills Animals (cooking)
Death Row (prison sim)
NationStates (nation sim)
Cyber Nations (nation sim)
Fisher-Diver (fishing sim)
Globetrotter XL (general knowledge game)
Memory Days (Dating Sim)
Millsberry (life sim)
Monster Breeder
My Pet Protector (Raising Sim)
Namco High (Dating Sim)
Politics And War (nation sim)
Relive Your Life (life sim)
The Wild Thornberrys: Australia Wildlife Rescue (raising sim)

Shooting Games

First-Person Shooters

Horizontal Side-Scrolling Shooters

Parasite Strike
Robot Dinosaurs That Shoot Beams When They Roar
RPG Shooter: Starwish (has heavy RPG Elements)
Wings Of Genesis (has heavy RPG Elements)
The Last Night

Shoot 'Em Up

Area Flat series
Bubble Tanks
Bullet Heaven (A spinoff of Epic Battle Fantasy.)
Bloons Super Monkey
Cube Colossus
Enigmata
Epic Boss Fighter
Figure Of Eight
Frantic Frigates
Wings.io
Neverending Light (horror)
The Peacekeeper
Raiders Took My Dog
The Tank Builder
Ultimate Crab Battle
Upgrade Complete

Third-Person Shooters

Mini Attack Urban Combat
Mibibli's Quest (also a Platformer)

Vertical Scrolling Shooters

Grinning Cobossus

Sports Games

Strategy Games

Turn-based

Real Time

Time Management Games

General

Digital Pet Games

Tower Defense

Multiple

Abobo's Big Adventure (Beat 'em Up, Platformer, Action-Adventure, Action and a Sports Game)
Big Fat Awesome House Party (MMO-like, sim and minigame based)
Bit Dungeon (Roguelike/Action RPG)
Black Market. Part SimulationGame, part resource management, part RPG.
Bloons Monkey City (Part Tower Defense, part Simulator Game)
The Breach (Platform Game / sidescrolling Third-Person Shooter, with RPG Elements, and a Survival Horror feeling)
Cactus McCoy (Beat 'Em Up/Platformer)
Deadly 30 (RPG, survival game, Tower Defense and a Shoot 'em Up)
Dikembe Mutombo's 4½ Weeks to Save the World (part Shoot 'em Up, part platformer)
Escape from the Spirit World (puzzle/narrative)
:game:
Henry Stickmin Series
Kings And Legends (MMORPG/CCG)
Lucky Tower
Legacy Of Heroes ({MMORPG/CCG)
Mario Mario Ace Attorney
Mega Mash
Monster Arena (WesternRPG/SimulationGame)
The Last Stand (RPG, survival game, and a Shoot 'em Up)
Pico (The various flash games across Newgrounds starring the Series Mascot cover a wide spectrum of genres.)
Ravenwood Fair
Realm of the Mad God: (Roguelike/Bullet Hell/MMORPG)
Riddle School (Puzzle/Adventure)
Rock Band World: Rhythm Game (companion app to one, at least)/genre-defying
Time Clickers: Idle Game / First-Person Shooter
Tyrant: ({MMORPG/CCG)
Valthirian Arc 1 (Action RPG/Time Management)
- Valthirian Arc 2 (Action RPG/School Simulation)
Webkinz
World Builder (Puzzle/Adventure/Strategy)
Xolga And Mr Toko (Puzzle/Adventure)

Genre-Defying

Akinator
An Other A Game For Social Change
Mush The Dawn
Babies Dream Of Dead Worlds
Battle Master
Battle Stations
But That Was Yesterday
Covetous
Demon Thesis (Half webcomic, half Final Fantasy Tactics style game where 4 modern day college students suddenly find themselves gifted with magic powers thanks to an Eldritch Abomination and fighting off hordes of monsters)
Die2Nite
Don't Shit Your Pants
Don't Wet Your Pants
Doodle God
Drawful
ERepublik
Every Day The Same Dream
KRFS
The Exhausting Adventures Of Gentle Sod
The Game
Gobtron
Happy Wheels
Hatfall
Icarus Needs
Immor Tall
The Impossible Quiz
Kongai
The Majesty of Colors
Motherload
Nickelodeon Clickamajigs
One Chance
Oppressive Games
Osada
poupéegirl
Pumkin Land
Say When!!
Steamshovel Harry
Today I Die
Transformice
Warbears
War of Omens
We Become What We Behold
The Wiki Game
xkcd Hoverboard
Zap Dramatic

Web Game Developers

Armor Games: along with hosting a number of games, they also produce many popular ones, including Crush the Castle, Achievement Unlocked .
io games
Berzerk Studio
Big Block Games
Bigpoint: Developer of Dark Orbit, Drakensang Online and Battlestar Galactica Online. Known for pushing the technological boundaries (especially in graphics as of late) of browser-based games.
Bonte Games
Con Artist Games
Fig Hunter - The website of Pseudolonewolf, the creator of the MARDEK series and Clarence's Big Chance.
Flipline Studios - creator of the Papa Louie Arcade restaurant games, Cactus McCoy and Remnants Of Skystone.
Hamumu Software - creator of the Robot Wants Series series.
Harold Brenes - creator of Fragger.
Ivory - creator of the Differences and Storm the House series.
Klicknation - creator of Superhero City, Six Gun Galaxy, Age of Champions, and Starship Command: Battle for Earth.
Koopa TV - creator of Defend Anita Sarkeesian and Trayvon Tyson's Punch-Out!!.
Mateusz Skutnik - creator of the Submachine series.
Minoto
Monstrum Games - creator of the Monsters' Den RPGs.
Nerdook - notably a fellow troper.
Neutronized
Ninja Kiwi
Orisinal
Nitrome
Square Enix (Chocobo's Crystal Tower and Knights Of The Crystal)
Undefined
Zeebarf - creator of the Adventures of Reemus, A Small Favor and A Vistor series.
Zynga, Inc.

Gaming Sites

Adventure Games Live
Armor Games
Crazy Monkey Games
Fettspielen
FunOrb
Homestar Runner - A site famous for its web toons but also contains a number of popular games.
Jay is Games - Critical web-game reviews on countless titles (with links included to try things out for yourself). Also a source of succinct walkthroughs and development contests where designers are challenged to create original works on a loose theme, and rewarded by voting. Gamers are rewarded by awesome original games that are free-to-play online.
Kongregate - Home to an active community of developers and the gamers who provide feedback (and occasionally donations) to their works. A large part of the site is the social networking aspect of flash gaming, increased by meta-game achievements the developers and site mods help create. Recently made part of the Gamestop network.
Miniclip
Neopets
Newgrounds - Known for its flash games, but also known for flash movies. Along with Kongregate, one of the leaders in web-gaming developer sites that include social review and meta-game rewards for players.
NMcCoy.net
NotDoppler
Hacked Arcade Games
Pogo.com
Puppet Nightmares
Puzzle Clubhouse - A series of crowd-designed "game episodes" that each combine an animated story and a short, quirky game.
Arcade Prehacks - Your favorite web games, with cheats.
MiniGames - Hand reviewed best online games. Every game is personally played and reviewed before it's allowed on the site.