This article lists software and hardware that emulates computing platforms.
Any x86-64 host computer or Virtual Machine equivalent (VMware, Xen, Hyper-V, KVM, VirtualBox).
While the ARM processor in the Acorn Archimedes is a 32-bit chip, it only had 26-bit addressing making an ARM/Archimedes emulator, such as Aemulor or others below, necessary for 26-bit compatibility, for later ARM processors have mostly have dropped it.
Macintosh Plus, Macintosh II, Macintosh Quadra
SpectraVideo SVI318/328, ColecoVision, Sega SG-1000
Note: NLMSX isn't compatible with Windows Aero, so the color schema is changed while NLMSX is running.
See also: comp.sys.sinclair FAQ at World of Spectrum
Thomson MO5, MO5E, MO5NR, MO6, T9000, Olivetti Prodest PC128