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STEEP free on Uplay.

STORIES UNTOLD free on Epic.
Undertale (Steam, DRM-Free) is $3.99 at Humble Store. It is an awesome game that deserves your attention and at this price you don't have a reason not to try it.

AppGameKit game development tool for those who want to create games, is down from €92,99 to free. Offer lasts until 19th of May 19:00 (CET summer time I presume, as that's where I'm live and where I see this date appear in the steam store):