Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

Goxel: Free and Open Source 3D Voxel Editor

free and open source voxel art tools - editor, thumbnailer and format converter

3D rendered proc-gen world test. C++ homebrew voxel engine for agent-driven prodedural generation / world simulation

Minecraft-like game engine written in C++17 with a client/server architecture and support for Lua modding

Build A World fork of Irrlicht

3D sandbox game that aims to be Minecraft compatible (functionality-wise)

A simple simulator of minecraft-style world

Render preview

Indexes all the user created mods on the Minetest forums

A simple 3d mesh viewer built with Irrlicht rendering engine.

Custom Minetest client

Minetest for MacOs

A Minetest building planner, not usable yet.