Currently the best free to play football management game out there in my opinion. Although it's played in a browser, the game has a real match engine running the games: you can watch your games live in 3D, something no other games of the same calibre can offer. The game is pretty deep with a lot of options in tactics, training, facilities, coaches, sales, a youth system, national teams, and so on. You won't be playing this game 10 hours a day, but you definitely need to put a lot of thinking and a long term vision into it if you'd like to succeed against other flesh and blood managers. This game was my first step in the gaming industry between 2009-2011, while we brought it to Hungary with some pretty nice success.