Looking for Life that I can tinker with.

[Oniya]

No, I'm not reanimating things in my basement.   Yet.

One of the most recognized examples of cellular automata is Conway's Game of Life.  With a few simple rules, it simulates a population that evolves over time, sometimes producing self-replicating patterns.  The versions I've found on the Web have the classic rules:

1) if a living cell has only one living neighbor, it dies.
2) if a living cell has more than four living neighbors, it dies.
3) if an empty cell has exactly three living neighbors, it comes to life.

What I'm looking for is a program, website, bit of coding, etc. that allows me to tinker with the rules so that I can find a way to simulate a gradual spread without a death factor, or with a higher death threshold, so that the result isn't too dense or too attenuated (possibly even including some random probability factor to make things interesting.)

[AmberStarfire]

I don't know anything about it personally beyond what you've said, but I Google searched 'conway's game of life online' and a lot of web pages came up.

This was one of them:
http://www.bitstorm.org/gameoflife/

There are programs on the Wikipedia page, with links:
https://en.wikipedia.org/wiki/Conway's_Game_of_Life#Notable_Life_programs

[mellowdude]

http://jsfiddle.net/ankr/tgjLA/

You could mess around with the code on that and see what happens.