Three keyboard layouts that work with MacOS 10.13 and later. Just place them into the folder Library>Keyboard Layouts
The Syriac keyboard is arranged in a similar way to the Arabic keyboard for Mac, so that those typing Syriac occasionally, but Arabic often can easily use it. The Hebrew keyboard has extra letters with diacritics, so that it is easy to type Judaeo-Arabic. The Latin keyboard is extended to give all the diacritics required to transliterate Arabic, Hebrew and Syriac.