Rule Type - General (With exception to rules that would cause the screen to flash)
Controls: Clicking / Dragging on the grid will inverse the cell state R - Restart current rule with blank grid S - Scramble current rule N - New Rule
You can copy and paste the url to show a rule to someone, it will change automatically http://rdsilver.github.io/2d-cellular-automata/#n=Ze5&r=DXp
If you want to run on your own machine, gh-pages is the active branch so download the zip from there.