Need a fun PC game to play thats free?

I used to play things like Maplestory, Combat Arms, Toontown, Minecraft, things like that. I still have minecraft but don't play it much. I quit maple and combat arms, and toontown has been shut down. Does anyone have any good suggestions for a free fun game to play that is for PC? I have a laptop with windows 8, it can either be in browser or download. Please give me some ideas, getting bored with playing games on facebook.

If your comp has high graphic cards. Get warframe it's basically a sci-fi shooter 3rd person. You can pay but you don't have to. It's a download game

Planetside 2, Warframe, League of Legends, Dota 2, War thunder, Blacklight Retribution, Hawken, Team Fortress 2 all excellent games