20 Free Procedural Generation Tools and Libraries (2026 Edition)

Reference implementation of Wave Function Collapse for bitmap and tile-based generation.
Use it for: tilemaps, texture synthesis, and learning WFC from source.

Fast noise library (Simplex, cellular, domains) in C#, C++, JavaScript, and more—ideal for heightmaps and masks.
Use it for: terrain, wind, and shader-friendly patterns.

Interactive explainers on noise, hex grids, pathfinding, and map generation with clear diagrams.
Use it for: understanding the math before you lock engine-specific tools.

Constraint-based generation from the same author family as WFC—great for studying rule-driven space filling.
Use it for: experiments and prototyping rules you may later port to your engine.

Classic dungeon article on carving rooms and mazes with readable diagrams and rationale.
Use it for: roguelike maps and 2D grid dungeons.

Built-in noise in Godot 4 for heightmaps, textures, and procedural parameters without extra plugins.
Use it for: terrain plugins, 2D worlds, and shader inputs.

Official PCG overview for scattering, splines, and graph-based procedural placement in Unreal.
Use it for: open worlds, foliage, and repeatable pipelines.

Official Unity learning hub with projects and modules tagged for procedural caves, meshes, and similar topics.
Use it for: step-by-step Unity projects alongside community repos.

Popular series on mesh-based terrain from noise, shading, and erosion-style ideas in Unity.
Use it for: visual intuition and mesh + noise workflows.

Community wiki collecting dungeon algorithms, room placement, and roguelike map patterns.
Use it for: algorithm shopping and pseudocode references.

Procedural content generation wiki with algorithm lists and terminology used in research and indie talks.
Use it for: naming patterns and finding related papers.

FOV, dungeon generators, and map utilities in the browser—handy for prototypes and 7DRL-style jams.
Use it for: quick web demos and teaching map gen.

Living index of open-source repos tagged procedural generation across languages and engines.
Use it for: finding ports, plugins, and small experiments.

Free 2D level editor with rules, auto-tiling, and exports that pair well with procedural prefab pipelines.
Use it for: authoring tiles that your generator places at runtime.