Humble Bundle is giving away four free games to the general public to promote their Humble Monthly Trove service. From now until June 1, 2018 at 10 a.m. Pacific time, the following games will be available free for everyone: Quiet City, Knight Club, Uurnog, and Hitchhiker. They are all DRM-free games (no Steam key).
Just log into your Humble Bundle account, and go to Trove from this link, scroll down the page a bit and click on the games I have listed above and press the green Download button. Ensure that you have selected the correct platform available (Windows, Mac, or Linux, not all games are available on all three platforms).
If you’re interested, you can also sign up for Humble Monthly for $12 a month. Humble Monthly subscribers have full access to all the DRM-free titles in the Humble Trove.