Parcellite is small and lightweight basic-features-only GTK+ clipboard manager. It has a clipboard history, supports synchronization of mouse selection and clipboard events (ctrl+c), persistent history, hostkeys and clipboard-based actions. It works well under Xfce, LXQt and fluxbox. Support for system tray icons either by the window manager or the desktop environment is preferable but not required, the clipboard history can shown using any defined hotkey.
Parcellite is licensed under the GNU GPL v3. Gilberto "Xyhthyx" Miralla involvement is indicated.
Parcellite has all the features you would want from a clipboard manager even though it has a light memory and disk footprint.
Parcellite is highly configurable. What you select with the mouse can be synchronized with selections by ctrl+c - or not. The history can be saved between reboots or discarded. The number of items in the history can be set to a high or low value.
You can set your own keyboard shortcuts, choose if selection should be synchronized or ignored and custom actions can be defined and activated when certain kinds of content is copied to the clipboard (links can be opened in web browsers, etc).
Verdict And Conclusion
Parcellite is a very light-weight yet powerful clipboard manger. It is very configurable. That may be a source of confusion or a strength depending on how you see it. You can make it act and behave the way you want if you spend a few minutes looking over all the available settings.
It is a good choice if you want something light that works in any window manager and/or desktop environment.
Parcellite stores it's settings in two files called "actions" and "history" in $HOME/.local/share/parcellite/