https://www.origin.com/ru-ru/store/free-games/on-the-house

http://woobox.com/mrvsyz

https://gamesrepublic.com/

https://www.indiegala.com/store

https://www.indiegala.com/store

https://www.indiegala.com/store

https://www.indiegala.com/store

https://www.indiegala.com/store

http://www.pcgamer.com/we-have-65m-worth-of-steam-keys-to-give-away/