Glances is a free LGPL licensed cross-platform curses-based monitoring tool that can provide me a maximum of information about your cpu, disk I/O, network, nfsd, memory and more in a minimum of space in a terminal. It can also work in a client/server mode for remote monitoring. This utility is written in Python and uses the psutil library to fetch the statistical values from your server.
Read more: Linux: Keep An Eye On Your System With Glances Monitor
