Process Explorer

Process Explorer shows you information about which handles and DLLs processes have opened or loaded.

Free Windows

iStat Menus

iStat is a series of system monitor apps.

Commercial

Atmonitor

Mac OS X System Monitor and Process Explorer Tool atMonitor is the most advanced monitoring tool for Mac OS X that displays system activity in real-time.

Free Mac OS X

XRG

XRG is an open source system monitor for Mac OS X. XRG allows you to monitor CPU activity, memory usage, battery status, machine temperature, network activity, disk I/O, current weather, and stock market data.

Free Open Source Mac OS X

BitBar

The BitBar app lets you put the output from any script or program right in your Mac OS X menu bar. And it's completely free.

Free Open Source Mac OS X

iPulse

Using its concise and appealing user interface, iPulse graphically displays the inner workings of OS X on your desktop, menu bar or Dock.

Commercial Mac OS X

TaskExplorer

Explore all the tasks (processes) running on your Mac with TaskExplorer. Quickly see a task's signature status, loaded dylibs, open files, network connection, and...

Free Personal Mac OS X

px

px tells you what processes are running on your system and how they are interconnected.

Free Open Source Mac OS X Linux BSD

OS Track

Keeps track of system resources.

Free Mac OS X

Tasks Explorer

Tasks Explorer is a freeware opensource computer program providing functionality for collecting extended information about processes running in system in real time. ...

Free Mac OS X

MagicanLite

Magican Lite is a free system monitor utility. It could help users monitor CPU and memory usage, watch on download and upload speed and detect temperature of CPU and GPU from the tiny and flexible floating window.

Free Mac OS X

Monity

Monity is an advanced system monitor that takes place in macOS Today View and oversees component statistics.

Commercial