I was a massive Commodore 64 fan back in the day, heres the release notes:

VirtualC64 v1.6 is released. VirtualC64 is a C64 emulator for Mac OS X from Dirk W. Hoffmann. VirtualC64 emulates a Commodore 64 personal computer on your Macintosh.

VirtualC64 v1.6 Changelog:
- Metal code has been ported to Swift and internal texture size bumped up to 2048x2048 texels.
- Texture post-processing has been separated into two phases which can be controlled independently in the emulator preferences window. It is now possible to combine a pixel upscaling algorithm with a texture filtering algorithm which are both run as seperate compute kernels on the GPU. With EXP and xBR two commonly known pixel scaling algorithms have been implemented.
- VIC-II compatibility has been improved further by Fabio Ritrovato (Thanks, Fabio!).
- The VICE color palette has been updated with new RGB values. It is now the default palette.
- Text snippets can now be dragged and dropped into the emulator window.

download http://www.dirkwhoffmann.de/virtualc64/

via http://www.emucr.com/2018/01/virtualc64-v16.html