Z64K Beta (2016/05/20) is released. Pixel exact emulation of the Commodore 64, VIC 20 and Atari 2600 written entirely in Java. The emulators should run on any platform with an updated java runtime environment installed.

Z64K Beta Changelog:
20 May - C64 Beta
Fixed sprite enable timing bug I accidently introduced 9 January . The cat face and the effect behind it display correctly in Wonderland XII again.

19 May - C64 Beta
Fixed keyboard loosing focus and screen sometimes stayingblack when switching to full screen mode.
Improved Full screen support. Full screen mode uses double buffering and is stable now. ALT-ENTER to toggle

18 May - C64 Beta
Improved screenshot functionality - Can save when emulator is paused. Fixed saving of aspect ratio which was distorted in some modes
Tabbed settings
Minor tweaks to Testbench screenshot handling
Fixed default value of available full screen modes to correctly show the current resolution. note: full screen mode functionality is not considered stable yet. If screen becomes corrupt, exit by pressing ALT-ENTER (this key sequence toggles full screen on/off)
View menu removed from top menubar. All view menu items have been moved to screen settings.

Download: Z64K Beta (2016/05/20)
Source:Here