"Dropbox is an easy way to store, sync and share files online
and supports Windows, Mac, Linux as well as mobile. But according
to developers of Sparkleshare, Dropbox has downsides as well: you
can't host your own server; it's not open source and has some
freaky things in its license agreement.sparkleshare
"Sparkleshare provides almost all the features of Dropbox and
has other benefits like better Gnome integration..."