Procedural Generation middleware
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BlocksBeyondTheStars
A block-based 3D space crafting game: explore procedurally generated planets across many star systems, mine and craft, tame creatures, build ships, bases and your own space stations — solo or with friends. Open-source .NET server + Unity client, self-hostable.
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FastNoiseLite
Fast, portable noise generation library for procedural generation (terrain, textures, worlds).