Free games?

The only free games that I do play are: League of Legends, Summoners Wars (Mobile), Warframe. They are very fun, and in my opinion are very balanced (Summoners Wars and Warframe got microtransactions... That's bad, but welp... Nothing is perfect). League of Legends and Warframe can be played with your friends and are very good in that extent, summoners wars is basically solo play when you have nothing else to do.