Brickadia is kinda like old roblox. It's more like a remake of blockland. Source: about 2 years ago

So last night when I was looking around for blockland related content on YouTube I found a video that talks about a new game named brickadia and it just looks like a modern version Ans currently it's for free until the game is finished just wanted to tell yall if you guys didn't know already Https://brickadia.com/. Source: almost 3 years ago

There is also Terasology - a Minecraft-like voxel game with fancy graphics: https://terasology.org/. - Source: Hacker News / about 1 year ago

You might be interested in looking into a few Minecraft clones if price is a concern - Minetest is the most well known one from what I've heard but I was recommended Terasology a few years back. Source: over 1 year ago

Terasology has active contributions, but the link to it is super old. terasology.org should be the current. I think the GitHub link is correct, though. Source: over 2 years ago

Terasology would love for this stuff to be easier, but is unlikely to use anything closed-source for a piece as integral as the application updater. Source: about 3 years ago