Recently I was made aware of nmon. Usually when you are trying to debug performance problems on servers you launch a whole set of programms, each in its own terminal: htop, iostat, iotop, iptraf etc. only to instantly loose the overview of the plethora of information shown to you.
Now ntop can show you most of these informations in one place, with nice ascii graphs.
Fortunately ntop is still being actively maintained.
Tomáš Pospíšek, 2016-07-19