Dropsync is described as 'DropSync is a super fast and flexible folder synchronization tool' and is a File Sync App in the Backup & Sync category. There are more than 10 alternatives to Dropsync for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet. The best alternative is rsync, which is both free and Open Source. Other great apps like Dropsync are GoodSync (Freemium), Unison (Free, Open Source), DirSync Pro (Free, Open Source) and Syncovery (Paid).
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.
Organyze SYNC, a Windows application for desktops and laptops, takes care of the headache of keeping files updated in all locations in today’s fast moving world, where we use multiple computers and devices for work, social activity and fun.