Atrise Lutcurve is a calibration software for LCD or CRT monitors for 6500K gamma 2.2. The program will help you to calibrate your LCD or CRT displays without any hardware devices. A multi-display PC installation is also supported. You can also setup your displays to show the same colors. The quality of the calibration is depend on your carefulness and may be very approximate to hardware calibration results.
Atrise Lutcurve is shareware, you can free download and try it for free during trial period. After that you may buy it for $28 or should delete it.