You can also create everything from drifting tectonic plates and forming continents to water erosion and detailed terrain and use the result in your project.
Devote Games released a curious free tool that anyone can use to create a realistic, Earth-like planet by adjusting various settings, which seems perfect for world-building or even educational use. The generator includes tectonic plate simulation, temperature and precipitation modeling for accurate biomes, and realistic mountain generation. It also has 10 unique generation settings to help you create the ideal planet for your needs and 9 different render modes.
You can customize display options like planet rotation speed and sun direction. The worlds are explorable with scalable resolution, and you can export your creation as a glTF file, complete with textures, for editing in Blender or use in a Unity project.
Whether you're interested in game development or planet simulations or simply enjoy seeing complex systems in action, check out this breakdown, where the developer explains how the simulation works and dives into the process of creating realistic planets using procedural generation and custom optimization in Unity:
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