free Game with trading cards
http://store.steampowered.com/app/253030/?snr=1_7_7_151_150_1

as far i know

free-steam-key-epigenesis
http://www.indiekings.com/2015/07/free-steam-key-epigenesis.html

Note: Need facebook account

grab a Orborun free steam key now!

https://www.indiegala.com/trades

grab a Hyper Fighters free steam key now!
https://www.indiegala.com/store

1.Scroll down middle ways.
2.Enter email.
3.Goto the email and click the email you get.
4.Look under your profile and get the key.
5.Install and Enjoy.

grab a Hostile Waters: Antaeus Rising free steam key now!
https://www.indiegala.com/store

1.Scroll down middle ways.
2.Enter email.
3.Goto the email and click the email you get.
4.Look under your profile and get the key.
5.Installed and Enjoy.