Plasma System Monitor
Plasma System Monitor, also known as KSysGuard or KDE System Guard, is designed to make simple process control available to a user without needing to do any special setup.
Installation
Plasma System Monitor is usually installed as part of the KDE Plasma Desktop environment, but can be installed from the Software Center or via terminal:
sudo eopkg it plasma-systemmonitor
Usage
KSysGuard User’s Guide or the KDE UserBase Wiki (open khelp on your Plasma Desktop).