It is huge set of libraries and tools for simulation modelling.

Sim++ is an object-oriented C++ library, compatible with SimPack
queuing is C library, simular to simpack and SMPL
Xsimcode is graphical generator of SimPack models
sdsmt    is graphical tool for slice modelling
fsa      is finite state automaton simulator
markov   is marcov chain simulator
petri    is petri net simulator

An WWW-page and mailing list devoted to SimPack exists.

SimPack is copyrighted by GPL license, version 2 or later.  Please read
the copy of this License in /usr/local/share/SimPack.

For more detailed information about SimPack, please refer to 
/usr/local/share/SimPack/README.