List of Places You Can Find Free Steam Games

1. Steamgifts

Winners are chosen at random and it is up to the winner to complete the transaction by accepting and redeeming the gift.

2. Playblink

Like steamgifts but here you play arcade games for points and with those points you have chances to win games.

3. GameMiner

Like steamgifts winners are chosen at random and it is up to the winner to complete the transaction by accepting and redeeming the gift.

GameMiner invite codes link

4. Tremorgames

Tremor Games is a site where you can play free flash games, win achievements, earn trophies, get highscores and earn Tremor Coins. 

You can redeem the Tremor Coins for various items including many Steam Games. 

Everything is for free - from registration to getting a Steam Game in your account!

5. Reddit

There are multiple subreddits dedicated to free game giveaways and all you have to do is regularly visit if you hope to find someone willing to share.
Random Acts of Gaming &  Gift of Games