Z64K Beta (2016/04/20) 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 (2016/04/20) Changelog:
Mouse support and improved configuration for control ports - Accessed via Devices menu under settings.
ALT-J swaps devices in control ports (replaces F11 swap)
ALT-G toggles capturing of mouse events. Mouse must be selected on one of the control ports via the Devices menu before the capturing of mouse events becomes effective.

Download: Z64K Beta (2016/04/20)
Source:Here