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FreeFileSync is a free Open Source software to synchronize files and synchronize folders available for Windows, Linux and Mac OS X. It is designed to be easy to use while having nice visual feedback along the way.

Duplicati is the only portable backup program, able to send backups in encrypted form to another computer or SkyDrive using one of several methods (WebDAV, FTP, SFTP/SCP/SSH, Amazon S3, Rackspace CloudFiles, USB disk, Windows network share). Time scheduler e.g. for auto-backups every 3rd Monday on 10 a.m.German, Danish, English, French, Portugese. Can also be startet from command-line. Support for snapshots via VSS and LVM: Backup of open files. Duplicati is a rewrite of Duplicity/ftplicity, written for Windows (in managed C# .NET). It also runs on Linux using the Mono framework.The lastest portable version in all 5 languages can be downloaded as a zip file from https://github.com/duplicati/duplicati/releases »

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. »

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.

GoodSync is the high-end professional easy and reliable file backup and file synchronization software.

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

AkrutoSync offers direct, two-way, cloud-free synchronization of contacts, calendar, tasks and notes between Outlook and all Android, Windows Phone, iPhone, iPad, iOS devices, phones and tablets. Access your Microsoft Outlook contacts, calendar, tasks and notes from your smartphone or other device, even when not connected to the network. You maintain control and privacy as your personal data is stored your own computer, not in the public cloud.

Déjà Dup is a simple backup tool. It hides the complexity of doing backups the 'right way' (encrypted, off-site, and regularly) and uses Duplicity as the backend. It features support for local or remote backup locations, including Amazon S3.