Browser based free games
Play free and free-to-play games designed to be played direclty in a browser (this includes both browser-based games and flash games)
Here are some of the best browser games you can play directly online: MMORPGs, collectible card games, strategy games and more. Browser games usually doesn't require nothing more than an updated browser (Chrome, Firefox, Edge, Opera, etc.) and are playable on any PC or Mac. Some of them may require a Flash plugin.
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Tetris Fun
puzzle / tile-matching
zygomatic
Video Strip Games
card game / strip poker
videostripgames.com
Anno Online
strategy / MMORTS
Ubisoft Blue Byte
Rail Nation
simulation / management
Travian Games
The King's League: Odyssey
strategy
Kurechii
Hero Zero
RPG
Playata GmbH
Realm of the Mad God Exalt
RPG / MMORPG
Wild Shadow Studios
The Settlers Online
strategy / MMORTS
Blue Byte Software
Therian Saga
RPG
Fatecraft
Battlestar Galactica Online
shooter / MMOFPS
Bigpoint Games
Epic Battle Fantasy 3
RPG / JRPG
Matt Roszak
Monster Slayers
action / brawler
Nerdook
Fairune
RPG / JRPG
Skipmore
Questionaut
adventure / point & click
Amanita Design
Supremacy 1914
strategy / wargame
Bytro Labs
Adventure Quest Worlds
RPG / MMORPG
Artix Entertainment
Lost Pig
adventure / interactive fiction
Admiral Jota
Imperia Online
strategy / MMORTS
Imperia Online Ltd.
Travian: Legends
strategy / MMORTS
Travian Games
Kingdom of Loathing
RPG
Asymmetric Publications
Popmundo
simulation
ExtraLives AB