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.
vtop is a graphical command-line tool that uses unicode braille to chart CPU and memory usage. It can be easily extended.
Yet another cross-platform graphical process/system monitor.
Top-like interface for container metrics. ctop provides a concise and condensed overview of real-time metrics for multiple containers as well as a single container view for inspecting a specific container.