The ucsd-psystem-vm project is a portable virtual machine (p-code interpreter) for the UCSD p-System. It supports execution of Apple ][ Pascal programs, it can even display TurtleGraphics using X11.
N-sim is a framework for studying and developing wireless sensor networks. It emulates the computation of sensor platforms, simulates the wireless communications, and allows plug-in models for source detection simulation. Intended for cluster computing.
PARASOL is a C library for implementing computer-system simulations.
PARASOL is a C library for implementing simulations of computer systems. It supports a simulated, user-configured, multiprocessor environment on which user-written software (in C or C++) is executed.