Sites and apps similar to Sternum include htop, which is free and open source. Other options are Glances, Usage, Resource Monitor and Atop. In total there are six Process Management Tools like Sternum for Linux, Mac, Windows, iPad and iPhone.
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 that runs in the terminal. The available columns are: PID, STATE, PPID, PGRP, SESSION, TTY_NR, TPGID, MINFLT...
Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.
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System Activity Monitor for Mac, iPhone, and iPad. Customizable, precise, and lightweight apps to keep an eye on the activity and performance of your devices.
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.
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An advanced interactive monitor for Linux-systems to view the load on system-level and process-level.
Linux has always been able to show how much I/O was going on (the bi and bo columns of the vmstat 1 command).
