Fans of the NFL probably know Mike Tomlin as the head coach who led the Pittsburgh Steelers through a long and respectable career, even if he only earned one championship ring in his 19 years with the league. Now, he's making a name for himself for a pretty surprising reason, as he's decided to share a [...]
Luanti is a good one too, although it might be closer to a minecraft clone than what you’re describing. It’s open-source though, and supports a fairly large modding community. There are all sorts of user-created extras that you can download and enable/disable as you please, right in the launcher.
They even have user-created game modes, so you can play the more traditional minecraft-style sandbox/survival game, or do various puzzles/mazes/platformers that people designed.
Vintage Story is a lot like that too. The only thing is there’s no mod browser in the game, you have to open a separate window for it.