Plug&Play Hardware simulation over a virtual bus system.
The Virtual Motherboard provides a specification of a TCP/IP based system bus, a motherboard simulator implementing this specifaction, and a collection of reusable device simulators. It is the perfect start to build new custom hardware simulators.
The CLOWN virtualmachine is a microcomputer simulator for operating system research. CLOWN emulates a realistic, though vastly simplified computer system. Besides the simulator itself, it includes assembler, linker, and disk maintenance tools.