Download of MirrorSync 6.59 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This Mac application was originally designed by 360Works. 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. MirrorSync for Mac lies within System Tools, more precisely File Managers.
From the developer:
MirrorSync is a handy way to sync FileMaker databases on an iPad, iPhone, or laptop without a network connection. Work on your own offline database at the fastest possible speed, and sync your changes with FileMaker Server when you have working network access.
You may want to check out more software for Mac, such as WheresTheFreeSpace, which might be related to MirrorSync.