Lagom LCD monitor - Lagom LCD Monitor is one of the best monitor calibration software that combines monitor calibration technology with an easy-to-use interface.
DisplayCAL (formerly known as dispcalGUI) - Open Source Display Calibration and Characterization powered by Argyll CMS
QuickGamma - monitor gamma calibration, monitor gamma correction, monitor gamma adjustment, adjust monitor gamma, calibrate monitor gamma, adjust monitor brightness and contrast, monitor gamma correction utility
ColorHCFR - Free Video Projector/Monitor Calibration Software
SuperCal - Visual display calibrator for Mac that generates ICC, ColorSync profiles
Online Monitor Test - Online Monitor Test is a tool that allows you to test LCD monitors.