Task managers

task manager application included with the Windows NT family of operating systems

task manager program found in many Unix-like operating systems. It produces an ordered list of running processes selected by user-specified criteria, and updates it periodically

system monitor program

free tool from Windows Sysinternals, part of the Microsoft TechNet website.

In computing, tasklist is a command available in Microsoft Windows and in the AROS shell. It was included in Windows XP and later Microsoft Windows operating systems.