Z64K (2019/04/28) 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 Changelog:
28 April
Re-enabled Full Screen options when display mode options are detected.
Disable Full Screen options of Full Screen modes not found.
Mirror Ocean Type 1 CART ROM LO to CART ROM HI. https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/C64/carts/ocean/ocean.crt cartridge works now.
Added command line options for soundrate and soundbufsize
-soundrate
Specify the sound playback sample rate (SoundSampleRate). (8000..192000)

-soundbufsize
Specify the size of the audio buffer in milliseconds (25..350).

Updated VIC20 VIC noise generator as discuss in VICE feature request #328 6561 noise generator has been reverse engineered
Mastervolume control enabled for VIC20 and Atari 2600.

Download: Z64 (2019/04/28)
Source:Here