dispcalGUI

dispcalGUI is a graphical frontend for several utilities from the open source color management system Argyll CMS by Graeme W.

Gill, specifically dispcal, dispread, colprof and dispwin, which when used together allow you to calibrate and profile your display using a measurement device. Of course, you can do a lot more with Argyll CMS, but this is not the scope of this document—refer to the Argyll CMS documentation for in-depth information and usage scenarios.
dispcalGUI opens a main GUI window when run, and a terminal-like window will be shown at the beginning of interactive display adjustment, which is currently needed for direct keyboard interaction with the Argyll CMS tools. It will be replaced with a graphical interface in the future. The main window is used to set options and access functionality.