Apps similar to Acrosync include rsync, which is free and open source. Other options are RsyncOSX, Truck - Rsync Client, cwrsync and lsyncd. In total there are five File Sync Tools like Acrosync for Mac, Windows and Linux.
Utility for Unix file and directory synchronization using delta encoding for efficient transfer, supports compression, incremental backup, remote operation via SSH, customizable filters, permission and timestamp preservation, and daemon mode on TCP 873.
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A graphical user interface for rsync, which looks-and-feels like a standard FTP client, but uses the rsync protocol ‘under the hood’ to boost transfer speeds.
cwRsync is a yet another packaging of rsync and Cygwin for Windows. You can use cwRsync for fast remote file backup and synchronization. Rsync uses the rsync algorithm which provides a very fast method for bringing remote files into sync.
Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default this is rsync.
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