Fuse (the Free Unix Spectrum Emulator) was originally, and somewhat unsurprisingly, a ZX Spectrum emulator for Unix. However, it has now also been ported to Mac OS X, which may or may not count as a Unix variant depending on your advocacy position. It has also been ported to Windows, the Wii, AmigaOS and MorphOS, which are definitely not Unix variants.
What’s new in v1.3.4:
• Fix syntax for "breakpoint read" debugger command
• Fix Z80 unit test 39 to test the right opcode
• Win32: Fix joystick initialisation
• FreeBSD: Use power-of-2 sound buffers