Intel SDE

Intel CPU emulator.

Closed source... free to use non-commercially.

https://software.intel.com/en-us/articles/intel-software-development-emulator

Can emulate some CPU features before hardware even comes out.

Usage: unpack the binary, and run:

./sde64 -- /bin/ls

Or more interestingly:

./sde64 -- cpuid

-- is mandatory.