I'm not sure if there's a complete list to be found, but engines usually have a showcase section on their website:
- Godot: https://godotengine.org/showcase/
- Löve (doesn't have a separate page, but showcases a few games at the bottom of the page): https://love2d.org
- DragonRuby: https://dragonruby.org/toolkit/game/samples
- Haxe (though not an engine per se): https://haxe.org/use-cases/games/
Also LibGDX - many of the games are Very Positive or Overwhelmingly Positive on Steam, too:
I've used LibGDX a few years ago. It was easy to create a basic game, but it seems to be moribund today. Most of the showcase projects are 4-5 years old.
LibGDX is still alive and well, and just released a new version recently. The API is relatively "finished" which imo is very nice and means old tutorials still work, and there's some exiting things maybe happening with getting the kotlin version to work on web without GWT (which is java only)
This is cool, is there even a mildly successful recent game made with it?
Sandship (not sure when released) was updated in Feb and has over a million downloads: https://play.google.com/store/apps/details?id=com.rockbite.s...
Zombie Age III has 10m downloads.
Deep Town: Idle Mining Tycoon has 10+m downloads (updated this year).
Space Haven is from 2020 with over 6k reviews on Steam.
(Open Source) Unciv has 6k stars: https://github.com/yairm210/Unciv