OpenBox is a Mac OS X application which can synchronize folders to remote servers via SSH and Rsync, and keep them synchronized automatically and continuously in the background, similar to how Dropbox behaves. If you make changes to any file or folder, those changes are instantly detected and propagated to the server. You can setup multiple boxes pointing to different servers, automatically copy URLs to your clipboard (if uploading to a web server for example), and receive notifications when sync operations complete.
The OpenBox UI is written in HTML5 / JavaScript, and the background daemons are written in Perl. The app is wrapped in a shell called Cocui which makes it behave like a real OS X app.
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