KDE Plasma Workspaces
Plasma Workspaces is the umbrella term for all graphical environments provided by KDE. Plasma separates components into "data engines" and their visualization counterparts. This is intended to reduce the total programming effort when there are multiple possible visualizations of given data; and to make it easier for the data engine and the workspaces to be written independently. Currently there are three workspaces being developed: Plasma Desktop for traditional desktop PCs and notebooks, Plasma Netbook for netbooks, and Plasma Active for tablet PCs and similar devices.
The Plasma Workspaces are released as part of KDE Software Compilation 4.
Read more about KDE Plasma Workspaces: Features, KRunner, Supported Widgets, Default Environment, Project Icon