The 4.2 version of zesarux for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The program lies within Education Tools, more precisely Languages. This free Mac application was originally designed by Cesar Hernandez.
From the developer:
ZEsarUX is an open source ZX Machines Emulator for Unix. Emulates Spectrum models: 16k, 48k (English and Spanish), Inves Spectrum, Spectrum 128k (English and Spanish), Spectrum 2 (English, Spanish and French), Spectrum 2A (English and Spanish), Microdigital TK90X (Portuguese and Spanish), TK95.
You may want to check out more Mac applications, such as Limon, eimantai Editor or PONS, which might be related to zesarux.