Right now you can get these 7 games for free from HumbleBundle till March 2, 2018. The games are:
2000:1: A Space Felony
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All of the mentioned games are playable on Windows, a few on Mac and only one for Linux. You may also see a monthly subscription button for $12. Forget the subscription. The only thing you need is a free account at Humble.
Click on the button below to download your free copy of any or all of the games mentioned above.