KDE Plasma Workspaces is a popular open source desktop environment for Linux and UNIX-like operating systems. It is highly customizable and designed to be lightweight and resource efficient. Some key features of Plasma include:
Plasma is developed by the KDE community. It focuses on user control, productivity and flexibility. The modular architecture allows power users to customize the desktop to their needs while keeping the interface simple for casual users. Plasma integrates well with underlying Linux/UNIX technologies. It can provide a full-featured yet light desktop environment suited for desktops, laptops as well as embedded devices.