SpudACE v0.314 is released. SpudACE is a new (2012) emulator written by Richard Chandler which will emulate the Jupiter ACE. Some features so far:

100% accurate Z80 emulation.
Drag and drop file loading.
File Formats supported .tap .wav .ace .txt
text file spooling
Accurate sound emulation.
Soft & hard rest.
View modes 100%, 200% Full screen.
Tape browser
WAV browser
Snapshot save (.ACE)
Set screen colours white (Ace default), green or amber.
Tools - SpudACE calculator
Save & Load configuration
Debugger
View Registers
View Memory
View Disassembly
PC logging

Keyboard layout & Keys:

Full Jupiter Ace keyboard emulated.
PC shift keys = Ace shift key (shift+8=( , shift+9=) shift+0 delete )
PC CNTRL keys = Ace symbol shift (cntrl+3=# ,cntrl+z=: )
PC ESC will pause / restart.
PC F2 - will run SpudACE at full throttle (no sound) PC F3 - SpudACE debug tools
PC F4 - full screen mode, when in full screen F4 reverts back to normal window screen

SpudACE v0.314 Changlog:
- ADDED: BORDER can now be set to full size, medium size or no BORDER.
- ADDED: AY sound card emulation.
- ADD: another screen colour option.
- FIXED: A very obscure bug in the Z80 core which no-one has noticed (including me until I fixed it).

Download: SpudACE v0.314
Source: Here