http://qmt.ath.cx/~nes/nintendulator/
February 9, 2006:
Nintendulator's NTSC palette generator has been updated with more accurate values, as well as a few bug fixes. Hue adjustment now ranges from -30 to +30, rather than from 300 to 360 (settings will be automatically adjusted on program startup), and Saturation is now properly set for each color