htop
An interactive process viewer
...The information displayed is configurable through a graphical setup and can be sorted and filtered interactively. Tasks related to processes (e.g. killing and renicing) can be done without entering their PIDs. Running to requires ncurses libraries, typically named libncurses(w). Since version 2.0, htop is now cross-platform! Check out the video and slides of Hisham's presentation at FOSDEM 2016 about how this came to be. The current releases support Linux, FreeBSD, OpenBSD, DragonFly BSD, MacOSX and Solaris. This is htop, a cross-platform interactive process viewer. ...