The best open source alternative to Dropbox is Nextcloud. If that doesn't suit you, our users have ranked more than 100 alternatives to Dropbox and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Dropbox are ownCloud, Syncthing, Seafile and Filen.
DeNet is an ecosystem, based on decentralized data storage that brings you the WEB3. Gives the users the convenience of regular cloud services and high level security with the lowest price tag in the market.
A graphical interface for the Rsync engine that will synchronise files between two computers either locally or over the internet. The beauty of Rsync is that it only transfers the exact part of a file that has changed (differential synchronisation), saving bandwidth and time.
s42transfer is a web site permitting to upload mulitple files in a simple way and give unique links with compressed files along with email sharing functionality.
Nubo is a self-hosted file sharing application. It runs on macOS, Linux and Windows (64-bit versions only).
Up1.ca is the simplest file hosting application you'll find on the internet. You just have to drag-in the file you want to share and the application will handle it. You can share any file you want with your friends in a more secured way as the file is encrypted on the client...
Filelocker is a web based secure file sharing application which facilitates easy file sharing between users at an organization and promotes secure data sharing habits.
dvcs-autosync is a project to create an open source replacement for Dropbox/Wuala/Box.net/etc. based on distributed version control systems (DVCS). It offers nearly instantaneous mutual updates when a file is added or changed on one side but with the added benefit of (local...
Safebucket is an open-source secure file sharing platform designed to share files in an easy and secure way, integrating with different cloud providers. Built for individuals and organizations that need to collaborate on files with robust security, flexible access controls, and...
FTPSync.pl is a PERL skript to synchronize a local directory tree and a remote FTP directory tree.
This program for Linux automatically mounts remote filesystems using ssh when the user attempts to access a file or folder within the not-yet-mounted linking folder.
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Instructions could be a little more detailed, but it works just fine. You need to have linux experience though to set it up.