I remember there was a scale from green to red that users created their own list of games that were based on topics like works will in dosbox or windows 7.
I think they were called remixes but what was nice about them was I could see a curated list of games that either just worked in dosbox or had source ports made of them so it didn't really matter what version i bought I can use dosbox/source ports on any OS despite the store listing.

GOGmixes!!

Yep, GOGMixes. We keep asking for that, they keep ignoring us.

Every now and then, there'll be a GOG weekly, midweek, or weekend promo, and they'll describe it as a GOG Mix. So you see, they never went away!

they're back, as pogs

Yes, GOG Mixes were awesome! I wish they would return.

We've been beating this dead horse for years now, sadly they won't make a comeback it seems.