px is described as 'tells you what processes are running on your system and how they are interconnected. To install, copy / paste this command line in a terminal: curl -Ls https://github.com/walles/px/raw/python/install.sh | bash It replaces:' and is an app in the OS & Utilities category. There are more than 10 alternatives to px for a variety of platforms, including Linux, Mac, BSD, Windows and PortableApps.com. The best alternative is Process Explorer, which is free. Other great apps like px are htop (Free, Open Source), Glances (Free, Open Source), GNOME System Monitor (Free, Open Source) and Windows Task Manager (Free).