GXemul is a framework for full-system computer architecture emulation. It emulates (networks of) machines, consisting of processors (ARM, MIPS, Motorola 88K, PowerPC, and SuperH) and various surrounding hardware components. It is complete enough to allow several unmodified "guest" operating systems
... [More] (e.g. NetBSD) to run inside the emulator as if they were running on real hardware. [Less]
Lxdream is a linux-based emulator for the Sega Dreamcast system. While it is still in heavy development (and many features are buggy or unimplemented), it is already capable of running many demos and some games.