Nowadays, as users work on multiple computers, it becomes inevitable for them to use file synchronization tools. Again, different people in a team work on the same file which makes it necessary to use file sync tools to collaborate with the entire team. Dropbox is an essential tool for much of my work. BitTorrent Sync. BitTorrent Sync I work with two Macs: a 5k Retina iMac and a MacBook. Syncios tool. Syncios is a household name capable of handling your sync tasks. It syncs iPad with Mac the old fashioned way with precision and accuracy. This tool has a classic user-friendly design and can easily be understood by anyone.
A file syncing app is a service or program that offers a convenient way to automatically synchronize your files across more than one computer or mobile device. Anywhere you're logged in to the file syncing app, the same files are available for you to open, edit, copy, stream, and so on, just as if you were on the device on which you initially uploaded them.
File syncing apps have plenty of uses, and the apps we've chosen work well in all occasions. For example, Dropbox stores your files online so that you can access them anywhere, while Resilio Sync skips servers altogether and syncs via a peer-to-peer connection.
Most of these apps are free, but some require a monthly subscription, especially if you want online storage too.
Dropbox: Access Your Synced Files Anywhere
What We Like

You can manually set bandwidth limits
Thirty days of undo history to recover deleted or changed files
All files are encrypted on the Dropbox website
Files can be uploaded to and downloaded from the Dropbox website (without needing to use the app)
What We Don't Like
Data must be stored online first in order to sync to other devices
Dropbox is one of the most popular cloud storage services, and for good reason. Anything you put into your Dropbox folder gets backed up online and downloads to any other device that's logged in to the same account.
In other words, Dropbox is a file sync utility because the folder on your computer in which you can store files is replicated to all of the computers and mobile devices that your account is connected to.
Dropbox is free for the first 2 GB of data. You can pay for more storage with the Plus and Professional plans, which offer 1 TB and 2 TB, respectively.
Resilio Sync: Sync Any Folder With Any Other Computer
What We Like
Your files are not stored online
You get to choose which folders to sync
Each folder can have its own permissions: read-only or read and write
No user account is needed; data is synced by special links or codes
Bandwidth control options are available
You can change the listening port
Encrypted folders can be created and synced
What We Don't Like
Can't access your files from a web browser because they aren't stored online
Resilio Sync (previously called BitTorrent Sync) is a peer-to-peer synchronization program
Best Free Sync App For Mac
Unlike Dropbox where you have to put every file you want to sync into the Dropbox folder, Resilio has you pick folders on your computer that will be synced to your other devices. For example, select your iTunes folder to share all your music between your different computers.
When you accept a folder share from another computer, you get to pick which folder on your computer is used to download the files. From there, any changes you make are reflected back to the other computer's original folder.
Some features, like selective syncing to sync only certain files from a folder, are available only if you upgrade out of the free version of Resilio.
GoodSync: A File Syncing Tool With Tons of Options
What We Like
Lots of options
Supports folders from a variety of locations
Filtering options let you exclude subfolders from a sync
Can sync files to and from your phone
Each device can browse through files on all the other connected devices
Also works as a one-way sync, backup service
Supports encryption and bandwidth control
What We Don't Like
Can get confusing with all the available settings
Download Tools For Mac
If you're looking for a file syncing program with the most options and greatest flexibility, you can't go wrong with GoodSync. Tons of options can be customized, and it works seamlessly between desktop and mobile devices.
Like most file sync apps, GoodSync keeps two folders in sync with each other. However, you can take it a step further and connect the program to your phone to back up your photos and videos automatically, or to send files from your computer to your phone on a schedule.
Unlike most file sync software programs, GoodSync lets you connect to a variety of locations in addition to your computer folders, like FTP servers and cloud storage services. If you don't use an online service, then GoodSync works like a P2P file sync program (i.e., no data is stored online).
Best Android Sync App For Mac
The free version of GoodSync has some limitations, like a maximum number of files that you can sync for any single job and a maximum number of jobs you can make in any one account.
You can buy GoodSync to get more features beyond the free version. For example, you can get GoodSync2Go to use on a portable device like a flash drive.
SyncToy: The Easiest Way to Sync Two Local Folders
What We Like
Completely free with no limitations
Really easy to set up
Lots of optional settings, like file, subfolder, and file attribute exclusions
Supports not only synchronize but also echo and contribute, two other ways to keep two folders in sync
What We Don't Like
Works on Windows operating systems only
Only Windows 7, Vista, and XP are officially supported
Can't sync to computers outside your local network
SyncToy is like a lesser version of the other syncing apps from above. It lets you keep two folders in sync but doesn't span across multiple networks.
In other words, the SyncToy file syncing program is handy if you like to keep a copy of your files in two locations like on your local hard drive and a flash drive, or on your external hard drive and a computer on your same network.
A practical use for SyncToy might be to pair your Music folder with Dropbox so that any changes you make to your music collection will automatically be copied over to Dropbox for online backup.
Tip
You can download a 32-bit or 64-bit version of SyncToy. Click the x86 option for 32-bit, or x64 for 64-bit.
SyncBack: Sync With Online File Storage Accounts
What We Like
It's free if you don't need the extra features
Lots of advanced customizations
Can be used to back up, sync, or mirror files and folders
You can sync with a variety of folders: FTP, Amazon Drive, Backblaze, Dropbox, Google Drive, OneDrive, SugarSync, and more
What We Don't Like
Windows 10 Sync Tool
macOS and Linux users can only use SyncBack Touch among the SyncBack options
SyncBack Touch is required if you want to sync to another computer off of your network
Best Sync Tool For Windows 10

Best Free Folder Sync Software For Mac
SyncBack is another syncing application that you install on computers you want to back up and synchronize. Several versions of this program are available, each with different features, including SyncBackFree, SyncBack Lite, SyncBackSE, and SyncBackPro.
All versions of SyncBack let you sync select files and folders, back up to FTP, compress files, and set other basic options. However, SyncBack Lite also supports copying locked files; SyncBackSE can works for business use and includes a USB app, incremental backups, and file versioning; and SyncBackPro can save to DVD with disc spanning, and keep emails backed up.
Itool For Mac
You can sync your files within your same network, such as another drive on your computer or a shared folder on a different computer. You can also sync your files to an online account like Dropbox or Google Drive. To sync to another computer not in your network, you have to buy SyncBack Touch.
Sync Tool For Mac
In short, SyncBack is a powerful software application with many other backup and syncing features.