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NiGHTS Into Dreams
Remastered collectathon for Windows, originally from the Sega Saturn. Free on Steam when you link your account to Sega (though I don't think you need to sign up for anything else and you can probably unlink as soon as the game is added).
As part of linking/claiming you'll be sent to a long URL which starts with localhost:3000
and won't load, just change that bit to sega60th.com
and it'll work fine (more details in this post).
I'm posting this on a Friday as it might end up being free forever, but equally the offer might stop at any point!
SEGA Bass Fishing
Fishing simulator free on Steam (via sega.com) until 31st July
You have to sign up now, but apparently they won't actually send you the code until after the deadline (1st August) so plenty of time to spam you in the meantime (hopefully not!)