All the applications have pro and cons. This is listed at the beginning of each header.

Nextcloud and Owncloud has build in file sharing. However these platforms provided many other functions and hence setup and basic file sharing is more complex than simply file sharing only applications. They also do not necessarily have the same basic functionality as simple file share applications.

My implementation of Nextcloud on Docker.

Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers in real time, safely protected from prying eyes.

Syncthing is a free and open source peer-to-peer file synchronization application available for Windows, macOS, Linux, Android, and BSD. It can sync files between devices on a local network, or between remote devices over the Internet. Data security and data safety are built into its design. Version 1.0 was released in January 2019 after five years in beta.

Unison is a file-synchronization tool for OSX, 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.

Unison shares a number of features with tools such as configuration management packages (CVS, PRCS, Subversion, BitKeeper, etc.), distributed filesystems (Coda, etc.), uni-directional mirroring utilities (rsync, etc.), and other synchronizers (Intellisync, Reconcile, etc). However, there are several points where it differs:

• Unison runs on both Windows and many flavors of Unix (Solaris, Linux, OS X, etc.) systems. Moreover, Unison works across platforms, allowing you to synchronize a Windows laptop with a Unix server, for example.
• 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. Conflicting updates are detected and displayed.
• Unlike a distributed filesystem, Unison is a user-level program: there is no need to modify the kernel or to have superuser privileges on either host.
• Unison works between any pair of machines connected to the internet, communicating over either a direct socket link or tunneling over an encrypted ssh connection. It is careful with network bandwidth, and runs well over slow links such as PPP connections. Transfers of small updates to large files are optimized using a compression protocol similar to rsync.
• Unison is resilient to failure. It is careful to leave the replicas and its own private structures in a sensible state at all times, even in case of abnormal termination or communication failures.
• Unison has a clear and precise specification.
• Unison is free; full source code is available under the GNU Public License.

Unison is quite old.

• Github Unison Old
• Wikipedia Unison
• Archwiki Unison
• Unison
• Using Unison Across Linux, macOS, and Windows

PrivateBin is a minimalist, open source online pastebin where the server has zero knowledge of pasted data.

Github PrivateBing