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Lancelot is an application launcher menu (or ALI) for KDE 4 designed to provide a place from which all your jobs begin. It provides quick access to applications, places, documents, contacts and system information.
Grouping Desktop is an activity containment for KDE's Plasma that adds to the desktop the ability to group your widgets inside groups of various types. There is a group that layouts the widgets inside a grid, one that puts them in a stack, one that puts them in tabs, one that leaves them free to move and others.