Process Monitor - Monitor file system, Registry, process, thread and DLL activity in real-time.
What's My Computer Doing? - Analyze which program accesses your hard disk in the background!
LikeTaskManager - A Qt based, self-contained (AppImage) tool that mimics the functionality of Windows 10 Task Manager's performance and process tab under Linux. It enables to oversee systemwide CPU, RAM, Disk I/O and Network utilization per device and per process.
Resource Monitor - Resource Monitor is a system application in Microsoft Windows operating systems.
SystemExplorer - Homepage of System Explorer. Freeware Tool for displaying and managing system internals
GNOME System Monitor - System Monitor is a tool to manage running processes and monitor system resources.