Moba Browser Games

Browser DOTA
http://browserdota.com/

Rougelike Browser Games

Ananias 
http://ananiasgame.com/play/ 

Sites Where You Can Watch Anime

Crunchyroll: Has Ads, But Also a Variety of Content
http://www.crunchyroll.com/

Dragonball Go: No Ads, With a Focus on Dragonball
http://dragonballgo.net/

GoGo Anime: No Ads, With a Variety of Content
http://gogoanime.io/

Best .io Games

Best .io Games

Agario: Cell Battle
agar.io 

Slither.io: Snake Battle
slither.io

Diep.io: Tank Battle
diep.io

Vertix.io: Third Person Shooter
vertix.io

Online Battle Arena Browser Games

Treasure Arena
http://play.treasurearena.com/

Real Time Strategy Online Browser Games

Little War Game
http://www.littlewargame.com/