forma

forma is a utility library for the procedural generation and manipulation of
shapes on a two dimensional grid or lattice.

The library provides a flexible Cellular Automata implementation, along with a
great deal of standard methods from computational geometry. For example 2-D
sampling by Poisson-disc or Lloyd's algorithm, Contiguous segment finding by
flood-filling, Binary space partitioning, Voronoi tessellation, hull finding
and more.