Plug&Play Hardware simulation over a virtual bus system.
GNS3 Network simulator Live USB
Live DVD with CORE network simulator
Acoustic Simulation Library for Frequency and Time Domain Simulations.
Turing and Post Machines' C++ Simulators
collection of illustrative programs:small games, simulators: C, Matlab
SW2PSA (Stop & Wait and Sliding Window Protocol Simulator and Animator
A cycle-accurate interconnection network simulator.