ZEsarUX

This is a cross-platform emulator that supports the following machines: ZX80, ZX81, ZX Spectrum (and 48k+), QL, Z88, Timex TS 2068, Sam Coupe, Pentagon 128, Chloe 140 SE, Chloe 280 SE, ZX-Uno, Prism, TBBlue/ZX, Spectrum Next, Jupiter Ace, Amstrad CPC 464, Microdigital TK series’s, Timex Computer series’s, Timex Sinclair, MSX1, Spectravideo 318/328, Colecovision, Sega SG-1000.

http://sourceforge.net/projects/zesarux