here are some free as in freedom games which are really good and don't requre big bad spooky proprietary operating systems also in the future please specify which free you are talking about
http://www.xonotic.org/ xonotic a fps arena shooter game based off of the darkplaces engine which was based off of the quake one engine. it is really fun but unfortionately not many people actively play
Konnichiwa minna-san!I'm new player in osu!And I tried to play nice in osu! standard mode.So don't hesitate to add me in friend list.And plus,I'm newbie so if I play bad,I hope you understand.So yoroshiku-onegaishimas!
I like Dragon Saga quite a lot right now. It's a "Re-opening" of Dragonica which isn't available anymore. By re-opening i mean it's the same game. Talking about game you shall know what is it about! Dragon Saga is a 2d/3d-ish MMOBrawler that makes you progress with very intresing set of skills. It has fun and fast pace since it's a brawler. I would recommend to anyone who likes MMO/Brawler.
And did i mention? It has no paywall. Well at least from as far as i have seen. And believe me i've played it since 2010 and sunk a large amount of time and never have i really felt the need to put money to become stronger.
A horror game you can download. It has 4 good endings and 6 bad endings (3 if you don't count to other 3 variations of one of the endings). The ending you get depends on the choices you make throughout the game. It has a nice story, too. Not much horror though.
The Witch's House
A horror game with lots of horror and many ways to die. I won't say much, but if you get the True Ending, there's an amazing twist which I refuse to spoil. Also read the novel, which is a prequel to the game's events.