Here's how you can install the Elementary OS file manager Pantheon in Ubuntu 13.10. Pantheon is a fork of the Marlin file manager, and it provides plugin integration with Dropbox and Ubuntu One.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:elementary-os/daily
sudo apt-get update
sudo apt-get install pantheon-files pantheon-files-plugin-dropbox
Pantheon File Manager is a simple, light, fast, powerful and forked from Marlin file manager. It is default file manager in Elementary OS and maintained by Elementary OS. It doesn't have too much functionality like Nautilus, it offers minimal graphical user interface but incorporates several features such as excellent management of previews, file properties, and so on detailed research.More at Noobs Lab
Additional resources for Elementary OS