Terrafinity is a work in progress 3d voxel game similar to Minecraft. Most game logic and world generation is multithreaded. There is also no world height limit, which lets extremely large terrain exist.
Terrafinity can be built using the zig build system.
To compile and run in release mode use zig build run -Doptimize=ReleaseSafe with a zig 0.17.0-dev.313+27be3b069 compiler installed.
I only tested it on x64 Linux so their may be issues on other platforms.