iCloud!

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. »

Outlook.com, part of Office Online (not to be confused with Microsoft Office Outlook ), is a webmail service from Microsoft, successor of Hotmail. Outlook.com offers IMAP and POP3 access as well as social network integration (e.g. Facebook chat).

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.

Amazon Drive is your hard drive in the cloud. Store your music, videos, photos, and documents on Amazon's secure servers. All you need is a web browser to upload, download, and access your files from any computer. Store files in your Amazon Drive and never worry about losing them if your computer crashes, or is lost or stolen.

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

OwnDrive is a security and privacy oriented cloud storage service that gives access to people’s data anywhere, anytime and from any device. OwnDrive makes storing, syncing and sharing of data easy. Our users have the ability to store, sync and share files, contacts, calendars, notes, music, photos, videos and a lot more. Listen to your music online, browse your photos with automatically organized albums, view your documents (such as PDF/ODF/TXT) and there are additional features available. OwnDrive’s unique external storage feature makes it possible to access, view, edit files stored on Google Drive, Dropbox, Amazon S3 etc. unified in your OwnDrive account. »

Get 5 GB of full featured Online Backup for free. Features include Automatic Backup, True Archiving, Versioning, Continuous Backup, Mapped Drive Backup and Web-based Backup Management.IDriveSync syncs files online across multiple PCs and Macs. On installing and logging into the application, it opens up a 'Sync' area where you can add the files you wish to sync.With iDrive Sync you can Sync up to 5 computers: Once you have new data into your Sync area, your Sync data starts getting transferred online, or 'Syncs-Up'. This essentially serves as an online backup of your data. Now, if you simply install and login on multiple PCs / Macs using same authentication, the synced data is 'Synced-Down' onto those multiple computers.Anytime you make a change to synced data anywhere on those multiple computers, all the computers will shortly reflect the modified data. »

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

CmisSync synchronizes files to/from any enterprise file server.It looks very much like Dropbox, but synchronizes with an existing file server instead of synchronizing with Dropbox's server.Can synchronize with Alfresco, Documentum, FileNet, SharePoint, Nuxeo, NemakiWare, eXo Platform, and any other CMIS-compliant server. Not cloud-based: CmisSync can work on local networks without Internet.

mailbox.org offers a secure e-mail account for home and business use. The domain name, [email protected], is easy to remember and can be understood anywhere in the world. They have been operating e-mail accounts for more than 20 years and are a highly reliable service provider.

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).

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fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!