There are 2 repositories under planet-generator topic.
A procedural planet generator addon for Godot with terrain LOD.
Pure Java random generator for planets
PlanetTechJS is an open-source JavaScript library built using vanilla THREE.js, for creating and editing planets at scale
Planetary system formation simulation in your browser, or on the server.
Fine-tuning stable diffusion to generate planet/moon textures.
A python program for procedurally generating planet-scale maps for Earth-like, spherical worlds.
a Unity script for procedurally generated 3D planets
HTTPS mirror of Torben Mogensen's planet generator along with modifications I and others made
Planet Generator with OpenGL rendering using Visualization Library