Pydio!

OneDrive (formerly known as SkyDrive) delivers a satisfactory online file storage and sharing solution in a free and easy to use service. It has a design that is both attractive and functional.OneDrive lets you edit your Microsoft Office documents online, it offers a lite version of three of the major softwares of the suite Word, Excel, and PowerPoint, so if you don't have the suite installed on your PC or Mac you can simply edit them online. So you have full access to your documents on all your computers, wherever you are. »

You should have full control over your data. We help you achieve that: a safe home for all your data. Secure, under your control and developed in an open, transparent and trustworthy way. We are Nextcloud.

Seafile is a file hosting software system. Files are stored on a central server and can by synchronized with personal computers and mobile devices via the Seafile client. Files can also be accessed via the server's web interface. Seafile's functionality is similar to other popular services such as Dropbox and Google Drive, with the primary difference being that Seafile is free and open-source, enabling users to host their own Seafile servers without artificially imposed limits on storage space or client connections. »

SparkleShare is a Free Open Source syncing tool. Its light, secure and easy to use. SparkleShare allows you to setup your own servers so you always keep control on your data.

Minimalist Drag & drop file sharing JS applicationDrag, drop and share

Pulse, officially-sanctioned fork of Syncthing , is a free, secure, and distributed file synchronisation engine.Synchronise your files without also sharing them with a stranger in the cloud.

Freehold - An open, secure, and lightweight platform for your files and data.

This is a multi talent file manager for admins and onsite-development.

Pogoplug is cloud storage which provides unlimited storage. Access all your files, photos, music and movies wherever you are. Automatically import your phone's camera roll to your cloud so you can share the photos and videos on your phone seconds after you capture them—friends and family can watch your videos instantly!

This addon aims to provide a convenient solution to securely transmit books, music, movies, and applications between different devices directly without the need to install either an internal or external plugin. It uses webRTC technology to deliver files in a secure peer-to-peer connection without a server being involved in the file transmission. In this technology, a server (signaling sever) is only used to locate peers (end-user computers).