nmon is described as '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' and is an app in the os & utilities category. There are more than 10 alternatives to nmon for a variety of platforms, including Linux, Mac, BSD, Windows and Flathub apps. The best nmon alternative is htop, which is both free and Open Source. Other great apps like nmon are Resources, Glances, BPYTOP and Pachtop.
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 way by using Python, implementing many functionalities offered by command line tools such as: ps, top, df...
An advanced interactive monitor for Linux-systems to view the load on system-level and process-level.
It also records history, just like nmon
Linux has always been able to show how much I/O was going on (the bi and bo columns of the vmstat 1 command).
iptraf-ng is a fork of original iptraf-3.0.0. IPTraf-ng is a console-based network monitoring utility. IPTraf-ng gathers data like TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte...
libstatgrab is a library that provides cross platform access to statistics about the system on which it's run. It's written in C and presents a selection of useful interfaces which can be used to access key system statistics.
Kiwi application monitor is a small program which lets you monitor your applications/processes, Windows and User activity...
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It also records history, just like nmon.