Welcome to one of the most exciting open source software developments in the embedded software world since GNU created GDB. OVP: Fast Simulation, Free open source models, Public APIs: Open Virtual Platforms.
If you are developing embedded software then virtual platforms will be increasingly important to you - especially if you are working on designs with more than one processor - then this portal will become an important resource for you.
Different between QEMU
Both of then are free, but great for multiprocessor platforms with arbitrary shared and local memory configurations.
Simulation of processors with virtual memory with almost no performance penalty.
Peripheral Simulation Engine (PSE)