AeroFS!

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.

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. »

SpiderOak provides an easy, secure and consolidated online backup, storage, access, sharing & sync tool for Windows, Mac OS X, and Linux (Ubuntu, Debian & Fedora). SpiderOak offers a different approach to online backup, synchronization, and sharing. This difference is not just measured in our zero-knowledge privacy policy - the first one ever employed in this setting - but also in our flexible design in handling data from all platforms (Mac, Windows, Linux) and locations (external drives, network volumes, USB keys) in one centralized account. »

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. »

Files on Yandex.Disk won't get lost if your phone or computer breaks. You'll have enough storage space for your most precious photos and important documents.

SugarSync lets you synchronize, backup and remotely access files and folders across your PC or Mac. You can also remotely view files from Windows Mobile, Blackberry, iPhone, Symbian and Android.

Librevault is an open-source peer-to-peer file synchronization program, designed with convenience and privacy in mind. Our goal is to make a better alternative to BitTorrent Sync and Syncthing.

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.

SyncTrayzor is a wrapper for Syncthing which allows Syncthing's window to be hidden in the tray area. SyncTrayzor has a built-in web browser to manage Syncthing without opening your browser. SyncTrayzor can be configured to automatically start at PC startup. A portable version is also available.

Syncany is an open-source cloud storage and filesharing application. It allows users to backup and share certain folders of their workstations using any kind of storage, e.g. FTP, Amazon S3 or Google Storage.

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