Here is an article I found about dropbox alternatives:

Box.com

It is a good alternative to Dropbox, which has already reached a high level of maturity. It is a service with diverse potential. It doesn’t just synchronize and backup your data, it helps you manage and share too. Thanks to a series of unique features box.com deserves the first place as an alternative to Dropbox. Of course, being a multi-platform service it allows you to share your data between devices like Windows, Mac, Linux, Android, etc.Wuala.com

Wuala’s strong point in their service is safety. In fact, the files are encrypted before it’s passed out to the server, even if you are still on the computer. Once these are sent to the server encrypted, you will only have access to them through Wuala. The basic package offers you 5GB free, which can be increased by purchasing additional space or inviting new people to join the service. The software client is available for Windows, Mac, Linux, iOS and android.Google Drive

Google Drive offers 5GB of free storage expandable for a fee (€2 per month to about 25 GB total). It has its strong point in the integration with other Google services such as Google Docs. It also provides tools that allow you to work in a team on the same files. Google Drive is available for Window, Mac, Linux, Android, iOS, and Chrome OS.Sky Drive

We could not miss the service of “synchronizing to the cloud”, the

Redmond software house provides you with 7 GB free space, thus beating off competition. The strengths of the service are better integration with Windows(8) and with Microsoft Office 2013. You can also edit office files directly online with the help of Office Web Apps. It is available for all major operating systems, fixed and mobile. On this page, you can find a comparison sheet with other services.Sugar Sync

In Italy, the service is provided in partnership with Libero, and therefore you have to have a free mail account to access the service. They offer the “usual” 5 GB that you can raise by paying a small fee. The client already has a good level of maturity having reached version 2.0. To learn about the features of the service visit this official page. By counting the number of users of Free Mail, I think it may be a good alternative to Dropbox for many.Team Drive

Team Drive has strong points in their algorithm of AES-256 encryption. In 2012, they also won the Award in IT Security confirmation of the safety standards, which makes it one of the best alternatives to Dropbox. It starts with 2GB of space for up to 10 GB with the mechanism of referrals (by inviting other people). The synchronization application file is available for Windows, Mac, Linux, and iOS and android. It can be very interesting for small and medium-sized enterprises that can use the server version to add to its network resources provided by the cloud.Cloud Me

Cloud Me differs from Dropbox and other services because in addition to the usual client for file synchronization, you can also use Cloud top which is a real desktop environment with customizable apps to suit your needs. It is as if you have a virtual machine, accessible at any time via the Internet, which uses Cloud Me as a hard drive. It starts from 3 GB free and clients “classics” are available for all operating systems and mobile accepted.Amazon Cloud Drive

All the power and speed of the Amazon server is at your service. Its speed is the strength of the service as well as simplicity. You have 5 GB free and are supported by a maximum size of a single file of 2 GB. For each account, you can connect up to eight devices and you cannot make the content public. This can greatly increase security, but limits a bit of possibilities. It is available for Linux ex client for Linux and unfortunately, the Italian language is not yet available.Own Cloud

This is the alternative most of all geeks have. As the name suggests with this web app you can create your own cloud home. In practice, it is a real content management system like Word Press, Drupal, or Joomla. The application is installed on the server side and is a little more complicated than any CMS. The server is available for Linux, Mac OSX, and Window7 and Server 2008. The client is available for Windows, Mac, Linux, Android, and iOS. It is excellent for small and medium business realities. You can find a demo version of the web interface.BitTorrent Sync

Finally, I want to report an increasingly popular new application that allows you to get a “private cloud” without the cloud! In fact, Bit torrent Sync is a very lightweight application that allows you to share a folder between multiple devices connected to a network, be it local or public (like the Internet). In which all the devices are “equal” and exchange information between among them. All this comes with maximum security because there is no intermediary / manager and then we have everything on hand. To access our files / folders to another user of Bit torrent sync needs a 32-character alphanumeric key that we need to provide. Once shared the secret file cannot be accessed shared by other users. If we share the code with someone we cannot, in fact, do anything to avoid doing it without our permission. Now the software is available in alpha version for Windows, Mac, and Linux. Android and iOS is still in the testing phase.