On: US intelligence mining data from 9 US Internet companies in broad secret program

[guelo]

Is there an open source dropbox-style app that I can install on my own server?

[pavs → guelo]

Yes, Owncloud. Easy to install:

http://www.slashgeek.net/2013/05/16/host-your-own-dropbox-li...

[fosap → guelo]

Git and Sparkleshare offer something that is IMO much close to dropbox than owncloud.

[johnxx → guelo]

Other people have offered some more "modern" options, but SFTP and WebDAV over SSL still work very well.

[JoshTriplett → guelo]

Try git-annex and git-annex-assistant; it doesn't even require a central server.

[micloud → guelo]

Try Tonido (http://www.tonido.com). It is not open source though.