Top probably is native from most of the Linux distributions.
top
Htop is an upgraded and very useful version of Top, but may require to be installed first.
sudo apt install htop htop
Iftop is a variation focused on network monitoring and may be installed first.
sudo apt install iftop sudo iftop -i eth0 -p -n
Bashtop, a powerful combination of both with a graphical (even over terminal interface) that makes the information much easier to be seen.
git clone https://github.com/aristocratos/bashtop sudo cp bashtop/bashtop /usr/local/bin/ bashtop
And finally, Bottom with incredibly integrated mouse features for selecting with a click and zooming with the scrolling wheel [Link].
sudo snap install bottom
OTHERS
sudo apt install glances -y glances sudo apt install whowatch -y whowatch sudo apt install tcptrack -y sudo tcptrack -i eth0 sudo apt install nload -y nload nload wlan0 sudo apt install ntop -y ntop sudo apt install speedometer -y speedometer -t eth0 speedometer -r eth0 -c -r lo sudo apt install ncdu -y ncdu
See additional information and source code of Glances at [Link].
Another amazing tool for navigating through the file system and execute commands directly is Broot [Link].
BONUS
Check the open-source WebGUI application called NetData [Link] and its Free Cloud Service [Link].
Similarly to the monitoring tools above, checkout CLI information acquisition tools for: