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...
Stacer is an open source system optimizer and application monitor that helps users to manage entire system with different aspects, its an all in one system utility.Discontinued
The last version (1.1.0) is from May 2019.
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.
KSysGuard, also known as KDE System Guard and KDE System Monitor, is designed to make simple process control available to a user without needing to do any special setup - the defaults are usually perfectly adequate.
vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage. It can be easily extended.
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.
LikeTaskManager vs Windows Task Manager opinions
It is good for monitoring process network activity but this does cause the high CPU utilization of around 3 to 4 % at idle. The process tab is not as good to monitor as it could be. Nice project but need improvements.
its excatly desinged for that, and contains unlike other also disk i/o and network i/o per process
unlike others it shows disk i/o and network i/o per process, likeTaskManager while also having an UI