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emailOpenRsync is a FREE, easy to use implementation of the rsync program.
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Go Managed File Transfer.
GoMFT is a web-based managed file transfer application built with Go, leveraging rclone for robust file transfer capabilities. It provides a user-friendly interface for configuring, scheduling, and monitoring file transfers across various storage providers.
Self-hosted file sharing platform | WeTransfer Alternative.
A powerful, self-hosted file-sharing platform built with PHP and Laravel with a Vue.js frontend. It offers secure, customizable file-transfer capabilities through an elegant user interface, giving you complete control over your data while providing a seamless experience for both senders and recipients.
Your files, delivered.
Peer-to-peer file transfers in your browser.
Using WebRTC, FilePizza eliminates the initial upload step required by other web-based file sharing services. Because data is never stored in an intermediary server, the transfer is fast, private, and secure.
Self-hosted WeTransfer alternative written in Go, with a Vue.js frontend.
erugo is a secure, self-hosted alternative to WeTransfer, built with Go and Vue.js. It combines powerful file-sharing capabilities with a sleek user interface, all packaged in a single, easy-to-deploy binary.
Easily send fully encrypted, secure notes or files with one click. Just create a note and share the link.
A user-friendly solution to transfer files through a physical diode using the Lidi utility, complete with data retention, file history, user accounts and admin management. Provides a scriptable API and a web interface.
Unison is a file-synchronization tool for POSIX-compliant systems (e.g. *BSD, GNU/Linux, macOS) 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.
The gold standard of macOS file transfer apps just drove into the future. Transmit 5 is here. Upload, download, and manage files on tons of servers with an easy, familiar, and powerful UI. It’s quite good.
resumable file uploads.
tus is the open protocol standard for resumable and reliable file uploads across the web, facilitating efficient and seamless file transfer experiences.
get things from one computer to another, safely.
This package provides a library and a command-line tool named wormhole, which makes it possible to get arbitrary-sized files and directories (or short pieces of text) from one computer to another. The two endpoints are identified by using identical "wormhole codes": in general, the sending machine generates and displays the code, which must then be typed into the receiving machine.
Sources:
Easily and securely send things from one computer to another 
.
croc is a tool that allows any two computers to simply and securely transfer files and folders.
Any File. Any Device. Cross-platform Network File Transfer Application.
A cross-platform network file transfer application designed to make transferring any file to any device as painless as possible.
France transfert permet d'envoyer des fichiers volumineux non sensibles de manière sécurisée à un agent de l'Etat ou entre agents.
HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC
Waarp provides a secure and efficient open source MFT solution.
Waarp Platform is a set of applications and tools specialized in managing and monitoring a high number of transfers in a secure and reliable way.
It relies on its own open protocol named R66, which has been designed to optimize file transfers, ensure the integrity of the data provide ways to integrate transfers in larger business transactions.