A new OppBSD version has been released which can be compiled and run on Linux (32/64-bit), Windows+MSVC and Mac OS/X, and has an extended documentation and other improvements. [download], [Wiki page]

OppBSD is an effort to get the network stack of the FreeBSD kernel working in OMNeT++ as a simulation model. In the model, every simulated host (or router) runs its own copy of the FreeBSD kernel's networking stack, and every host (router) has its own copy of all state variables of the FreeBSD kernel.