ZMacSync 2.5 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely Device Assistants. This software for Mac OS X was originally produced by DSITRI. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
ZMacSync is a tool to remotely access Linux Handheld devices like the Sharp Zaurus and Openmoko mobile phone from Mac OS X. For some models, this includes at least unidirectional synchronization of the Address Book, iCal calendars and to-do lists, as well as Stickies (notes) and the system clock.
You may want to check out more Mac applications, such as iStar Composer, Portable Nvu or Matchprint Virtual, which might be related to ZMacSync.