The 11.0.5 version of ChronoSync 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. The bundle identifier for this application is com.econtechnologies.chronosync.
This software for Mac OS X was originally created by Econ Technologies, Inc. We recommend checking the downloaded files with any free antivirus. The software is sometimes referred to as "Sync ChronoSync", "ChronoSync__K". The most popular versions of the program are 4.5, 4.4 and 4.3. The application's installer is commonly called cs4_download.dmg. The program lies within System Tools, more precisely Backup & Restore.
From the developer:
ChronoSync is an application for macOS that is capable of performing data backup, bootable backup and bidirectional file synchronization. It works by creating one or more synchronizer documents, each defining a specific task that you would like to perform. These tasks can then be run manually or scheduled to run automatically.
Backup and file sync tasks can target just about any type of device that can be mounted as a volume on your Mac.
You may want to check out more software for Mac, such as ChronoAgent, which might be related to ChronoSync.