ZX Spectrum Emulator (zx32)

Fast and very professionally done - help file, install/uninstall routines. Freely changeable window size, plus fullScreen mode (with rounded edges and ScanLine emulation), rainbowing and quite good AY emulation too, with selectable Frequency/volume/noise masking. Can open snapshots/tapes from within ZIP files without you having to unzip them. Good contended memory emulation. Automatically starts/STOPS tape files as needed, and gives a pretty good approximation of loading noise if you want it.