R.Frisch , D.Griffeath 
The program Excite! 
(251K, PC executable)

ABSTRACT.  This is the program Excite! writen by R. Frisch  D. Griffeath
to explore the time evolution of excitable media,
It is Freeware.
This program  runs on IBM PC's under MS-DOS
References:
Fisch R., Gravner, J. Griffeath, D.
Threshold  range scaling of excitable cellurar automata
Statistics and Computing 1
R. Durret
Some New games for your computer
Nonlinear Science Today 1 p. 1-7 (1991)