The following games can be obtained for free on DLH.net (thanks to Scaryfun for letting us know):
Enclave
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http://store.steampowered.com/app/253980/
X-Blades
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http://store.steampowered.com/app/7510/
Pirates of Black Cove
- Code: Select all
http://store.steampowered.com/app/49330/
Commander - Conquest Of The Americas (Gold version with DLC's)
- Code: Select all
http://store.steampowered.com/app/49300/
Simply create a free account on DLH.net and you'll find the Steam keys in your profile page.
Origin - On The House:
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https://www.origin.com/nl-nl/store/free-games/on-the-house
At the moment: Command & Conquer Red Alert 2 + Yuri’s Revenge are free of charge.
Indiegala:
Vertical Drop Heroes HD for free (thanks to oldman for letting us know):
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https://www.indiegala.com/store