Home of DSP Emulator, support many arcade, Coleco, NES, Amstrad CPC, Spectrum 48K - 128K - +3 (TZX, TAP, CWS, WAV, ZIP, Kempston, ULA+) and opensource.
rastersoft.com: Fbzx, The Spectrum Emulator For Framebuffer
A Sinclair Spectrum emulator, designed to work at full screen using the FrameBuffer or under X-Windows.
fuse-emulator.sourceforge.net: Fuse - The Free Unix Spectrum Emulator
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.
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