htop - htop - an interactive process viewer for Unix. This is htop, an interactive process viewer for Unix systems. It is a text-mode application (for console or X terminals) and requires ncurses. Latest release: htop 2.

Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Process Explorer - The top window always shows a list of the currently active processes, including the names of their owning accounts, whereas the information displayed in the bottom window depends on the mode that Process Explorer is in: if it is in handle mode you'l…

ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...

nmon - This systems administrator, tuner, benchmark tool gives you a huge amount of important performance...

LightShot - The fastest way to take a customizable screenshot.