Process Explorer
Process Explorer shows you information about which handles and DLLs processes have opened or loaded.
Using its concise and appealing user interface, iPulse graphically displays the inner workings of OS X on your desktop, menu bar or Dock.
monitor numerous os x statistics including: cpu activity system load over time network bandwidth and activity memory activity and usage battery & wireless signal strength disk usage current time and date compact, clever & fully customizable user interface presents information both graphically and with text beautiful on retina display fits in perfectly with the new system appearances save & load custom appearances minimizes impact on system performance view data on the desktop, in the menu bar or dock show & hide windows using system hotkeys
Productivity Utilities System and Hardware
monitoring customize hardware-monitoring
Process Explorer shows you information about which handles and DLLs processes have opened or loaded.
Free Windows
Process Hacker is a feature-packed tool for manipulating processes and services on your computer. A free and open source process viewer with powerful process termination and memory searching/editing capabilities.
Free Open Source Windows
Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity.
Free Windows
System Explorer is an enhanced Taskmanager that provides detailed information about running processes, startup programs, IE add-ons (BHOs), drivers, services network connections, system resources and more.
Free Windows
System Monitor is a tool to manage running processes and monitor system resources.
Free Open Source Linux BSD GNOME
Resource Monitor is a system application in Microsoft Windows operating systems. It is used to view information about the use of hardware (CPU, memory, disk, and network) and software (file handles and modules) resources in real time.
Free Windows
this is a port to os x el capitan 10.11 of menumeters by alex harper.
Free Open Source Mac OS X
Activity Monitor displays information about all the processes running on your Mac, including CPU, disk, memory, and network usage.
Free Mac OS X
KillSwitch is an advanced system monitoring tool that is apart of Comodo Cleaning Essentials (CCE) it allows users to identify, monitor and stop potentially unsafe processes that are running on endpoint systems.
Free Windows