There are 2 of them:

1. Anomaly Über (found by @En)
Subscribe to this newsletter [11bitstudios.us13.list-manage.com]

After that, wait until you get an email from 11bit studios with key on it

2. Evil Genius
Rebellion making another limited giveaway for this:
Evil Genius Giveaway [id.rebellion.com]

• Visit that link above
  
• Create/log in and linked it with your Steam account
  
• After that, the game will be automatically added into your library, no need for key
  
• The website is overloaded right now, try to wait a little bit and do it again

We are welcoming everyone to join our discord[discord.gg]. We are more active there on finding giveaways, small or large, and there are daily raffles you can participate.

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