Diodon is a simple clipboard manager for GNOME with application indicator support. Aiming to be the best integrated clipboard manager for the Gnome/GTK+ desktop.
Source Diodon Homepage: Diodon
It features include a panel indicator, Unity Scope allows searching history, clipboard sync and a zeitgeist integration for an infinite clipboard history. Diodon also supports images and plugins and it does just what a clipboard manager should do.
To install Diodon just run the following commands via your systems Terminal.
sudo add-apt-repository ppa:diodon-team/stable
sudo apt-get update
sudo apt-get install diodon unity-scope-diodon
You can launch Diodon directly from Unity Launcher.
That's it please enjoy this wonderful Software.