Simulation programs?

[utzoo!decvax!ittvax!swatt]

Does anyone know if any of the following programs were avilable to run
under UNIX:

     1.  Simscript
     2.  GPSS
     3.  Gasp
     4.  any simulation programs if 1,2,3 are not available.

Reply to:

	([decvax!])ittvax!ittapp!berney	(UUCP)
		or
	decvax!ittvax!ittapp!berney at berkeley (ARPA)