DisplayCAL can calibrate and characterize display devices using one of many supported measurement instruments, with support for multi-display setups and a variety of available options for advanced users, such as verification and reporting functionality to evaluate ICC profiles and display devices, creating video 3D LUTs, as well as optional CIECAM02 gamut mapping to take into account varying viewing conditions.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/dschubert/DisplayCAL/