Process Explorer

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

Free Windows PortableApps.com

htop

htop is an interactive process viewer for Linux. It is a text-mode application (for console or X terminals) and requires ncurses. htop is an interactive top replacement...

Free Open Source Mac Linux BSD

Process Monitor

Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity. It combines the features of two legacy...

Free Windows PortableApps.com

SystemExplorer

System Explorer is an enhanced Taskmanager that provides detailed information about running processes, startup programs, IE add-ons (BHOs), drivers, services network...

Free Windows PortableApps.com

Process Lasso

Process Lasso is NOT yet another task manager. It is a process priority optimization and system automation utility. Priority optimization, affinity optimization, core...

Freemium Windows

Windows Task Manager

Windows Task Manager is a task manager application included with Microsoft Windows NT family of operating systems that provides detailed information about computer...

Free Windows

GNOME System Monitor

System Monitor is a tool to manage running processes and monitor system resources.

Free Open Source Linux BSD GNOME

AnVir Task Manager

This tool controls programs, disk, CPU. Replace task manager, tweak and tune up XP or Vista. Speed up windows startup. Get rid of spyware and viruses.

• Warning Be careful! The downloader of AnVir Task Manager can install malwares! To avoid the InstallManager read the post at http://alternativeto.net/discussions/applications/12033/how-to-avoid-the-installmanager/

Freemium Windows

WinSpy++

Note: WinSpy++ appears to have been superceded by WinSpy. WinSpy++ is a handy programmer's utility which can be used to select...

• Discontinued catch22.net not working

Free Open Source Windows .NET Framework

Xfce Task Manager

Easy to use application for monitoring and controlling running processes. - Support for Linux, OpenBSD, NetBSD, FreeBSD and OpenSolaris. - Monitors the CPU and...

Free Open Source Linux

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. It is designed...

• Discontinued The official website is no longer available. Last version, 2.7.1, released on August 2012, can be still downloaded from Wayback Machine.

Free Mac

psutil

psutil is a module providing an interface for retrieving information on all running processes and system utilization (CPU, memory, disks, network, users) in a portable...

Free Open Source Mac Windows Linux BSD

Iotop

Linux has always been able to show how much I/O was going on (the bi and bo columns of the vmstat 1 command). Iotop is a Python program with a top like UI used to...

Free Open Source Mac Linux

StatusPilatus

StatusPilatus Monitor your PC like never before! Features - Cross-platform and free Monitoring - CPU usage, flags and temperature - GPU information, with support...

Free Open Source Mac Windows Linux

nmon

This systems administrator, tuner, benchmark tool gives you a huge amount of important performance information in one go. It can output the data in two ways

Free Open Source Linux