Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored, if it is shared with some third party and how it's transmitted over the Internet.

Syncthing - Open Source Continuous File Synchronization

rsync is a file transfer program for Unix systems. rsync uses the rsync algorithm which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand. It can update whole directory trees and filesystems. It can use rsh, ssh or direct sockets as the transport.

rsync - incremental file transfer program for Unix systems

sync is a lightweight utility to synchronize files between two directories on a system or between multiple systems. It synchronizes bidirectionally and allows the user to keep two copies of files and directories in sync. csync uses widely adopted protocols, such as smb or sftp, so that there is no need for a server component. It is a user-level program which means you don’t need to be a superuser or administrator.

csync -  A professional file synchronizer for normal users

FullSync is a universal file synchronization and backup tool which is highly customizable and expandable. It is especially for developers, but the basic functionality is easy enough for everyone. It supports multiple protocols like FTP, SFTP, SMB/CIFS(Windows Shares) and local files, Scheduled execution of synchronizations using intervals or a crontab like scheduling. Publication and update of websites, synchronization of local directories and making backups of your data.  

FullSync - File Synchronization and Backup Tool

MailCore 2 provides a simple and asynchronous Objective-C API to work with the e-mail protocols IMAP, POP and SMTP. The API has been redesigned from the ground up.

MailCore 2 - Simple and asynchronous API to work with e-mail protocols IMAP, POP and SMTP

Unison is a file-synchronization tool for Unix and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other. Unlike simple mirroring or backup utilities, Unison can deal with updates to both replicas of a distributed directory structure. Updates that do not conflict are propagated automatically.

Unison - File synchronization tool for Unix and Windows

CmisSync allows you to keep in sync with your company's file server, and read/edit the documents even when offline.  It works with any CMIS-compliant server like Alfresco, Google drive,  SharePoint, Nuxeo etc.

CmisSync - Dropbox-like sync for your company's file server

JFileSync is a Java application used to synchronize directories of two different file systems. For instance, you want to synchronize a set of directories on your laptop with a set of corresponding directories on your workstation.

JFileSync - Java File Synchronization

Csync2 is a cluster synchronization tool. It can be used to keep files on multiple hosts in a cluster in sync. Csync2 can handle complex setups with much more than just 2 hosts, handle file deletions and can detect conflicts. It is expedient for HA-clusters, HPC-clusters, COWs and server farms.

csync2 - cluster synchronization tool

FLoM is a free, open source, distributed lock manager that can be used to synchronize shell commands, scripts and custom developed C, C++, Java, PHP and Python software. When used in a shell environment, FLoM manages process serialization in the same way "nice" manages process prioritization.
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Shell commands, scripts and custom programs can be serialized/synchronized inside a single system or in a network of IP communicating systems. FLoM supports different types of abstract resources: simple, numeric, set, hierarchical. libflom, the library shipped with FLoM, allows you to develop your own application using a simple C, C++, Java, PHP or Python client API.

FLoM is a free, open source, distributed lock manager that can be used to synchronize shell commands, scripts and custom developed C, C++, Java, PHP and Python software. When used in a shell environment, FLoM manages process serialization in the same way "nice" manages process prioritization.

FLoM - Free Lock Manager

Sync Gateway connects Couchbase Lite to Couchbase Server. It manages HTTP-based data access for Couchbase Lite mobile clients, Leverages Couchbase Server as it's horizontally scalable backing data store, Clustered into a horizontally scalable tier, Provides access control and data routing.

Sync Gateway - Connects Couchbase Lite to Couchbase Server

brig is a distributed & secure file synchronization tool with version control. It is based on ipfs, written in Go. It supports Simplified git version control, Sync algorithm that can handle moved files and empty directories and files, Encryption of data in rest and transport + compression on the fly and lot more.

brig - A file synchronization tool on top of ipfs (and more!)

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