Kelvin Sherlock has released his Application wrapper for the MAME emulator. Ample 0.231 has been lined up with the release of MAME in the version number and runs on Apple machines with Mac OS 10.14 or newer.
The release includes a version of MAME which only supports the Apple-1, Apple II Series, and the Apple III computers. Work is currently being performed on the Macintosh emulation within the program but as of yet, only a subset of the features are implemented.
You can download the latest version of Ample from Kelvin’s Github page for the application at: