Z64K Beta (2017/07/19) 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:
17 September - All emulators
Fixed issue with latest version of Java where frame could loose focus after toggling between full screen and window modes.
NEWS ***UPDATE on progress of new UI*** I am very close to having all the features of the current emulators in the new improved UI so I am hoping to release it in the next few weeks for wider testing. If you would like a preview of it please send me a message and I will send you a copy now. :)

Download: C128 Beta (2017/09/17)
Download: C64 Beta (2017/09/17)
Download: VIC20 Beta (2017/09/17)
Download: Atari2600 Beta (2017/09/17)
Source:Here