Qaop 1.4 is released. Qaop is a ZX Spectrum emulator. Qaop is a Java applet which can be embedded on a page, but can also be run as a simple application. Qaop has been ported to JavaScript. (no Java requried, modern browser is enough). Also emulates Spectrum 128. Audio is available in recent Firefox and Chrome (no AY yet). It can be used as an offline web application.

Emulates Speccy 48K.
Good Z80 and screen emulation.
Sound: speaker and AY.
Loads SNA and Z80 snaps.
Loads TAP tapes.
Supports Gzip and ZIP compression.
2x zoom.

Download: Qaop 1.4
Source:Here
Run online