The 1.10 version of Acrosync 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. We recommend checking the downloaded files with any free antivirus. The program lies within Internet & Network Tools, more precisely Network tools. This Mac application was originally produced by Acrosync LLC.
From the developer:
Acrosync is a folder synchronization tool that supports Dropbox-style automatic file upload, as well as hourly incremental backups similar to Time Machine. Acrosync is based on the rsync protocol, which means it can sync with any Mac or Linux computer, or even a NAS device, without server installation. It comes with an easy-to-use graphical interface with which you can easily set up multiple sync profiles for different tasks.
You may want to check out more software for Mac, such as Duplicacy, which might be related to Acrosync.