Been playing Luanti Voxelibre, and been very content with its creative mode. But it spawns far too little ores, which makes the survival mode a pain. Or maybe I'm doing something wrong, idk.

yes but except you are a diehard free software fan there is no reason to not just play minecraft. it has basically no DRM, source code is no longer unobfuscated and it can be easily modded.

Exile! Luanti game.
I play it 1 life, fun.

I've tried Luanti with one of the many Minecraft recreations, and I must say that I can't get away from the actual Minecraft. I'm too attached to it, the surrounding community, etc. And I truly hope Minecraft will change for the better, but my expectations are low. It's currently being investigated by the EU, so that maybe will achieve some positive change.

Mineclonia (running on Luanti) is quite complete for a WIP, and tries to mimic Minecraft as much as possible in the engine. (Disclaimer: I have contributed to this repo)

Not open source, but Vintage Story is very good.

Vintage Story is a Minecraft-like that's fantastic. It's only source available but it's fully replaced Minecraft for me. It feels like "Minecraft for adults" since it's a lot more intense in terms of survival and building

What is the source of the image? I would like to check its license, since I would like to make use of it if the license permits it.

There is no good open source alternative in my experience, but hytale is a decent non-microsoft one

Uhh maybe Classicube and Lunati

My experience drove me to just pirate minecraft. The alternatives are ok, but they are not very polished, or they don't scratch the same itch. Minecraft really does just have that sauce.

Luanti is deeply modded, has a large selection of games (including the ones mimicking Minecraft), and a strong programming community.

I'm honestly surprised you researched Luanti the least.

Luanti is great.

Vintage Story is paid but awesome.

Also check out Veloren and OpenVoxel.

I have tried Minetest, but that was years ago. It probably needed some plugins to feel more alive.

Voxelibre, a luanti fork, is pretty great. My young lad plays it almost exclusively. It also runs on a potato which is great

Cubic Odyssey scratches the itch for me. It's more like a 3D Starbound, but it's all blocks. It's not open source though.

Oh and it's janky as hell