Golly

Golly is an open source, cross-platform application for exploring Conway's Game of Life and many other types of cellular automata.

Key features:

Supports bounded and unbounded universes, with cells of up to 256 states.

Supports multiple algorithms, including Bill Gosper's super fast hashlife algorithm.

Many different types of CA are included: John von Neumann's 29-state CA, Wolfram's 1D rules, WireWorld, Generations, Langton's Loops, Paterson's Worms, etc.

Reads RLE, macrocell, Life 1.05/1.06, dblife, and MCell files.

Can extract patterns and rules from zip files.

Can download patterns and rules from online archives.

Includes a state-of-the-art pattern collection.

Unlimited undo/redo.

Extensive help, with an integrated Life Lexicon.