ownCloud gives you universal access to your files through a web interface or WebDAV. It also provides a platform to easily view & sync your contacts, calendars and bookmarks across all your devices and enables basic editing right on the web.
Sharing work made easySparkleShare shines by its absence. Unlike other syncing tools it's designed to get out of your way, to make sharing documents and collaboration easier, and to make peers aware of what you are doing.