Rgb2Cmyk is a freeware utility program for converting Xara X Pantone CMYK images.
The Scribus Team
It brings professional page layout to Linux/UNIX, Mac OS X, etc.
Real Software Solutions
Real PDF Printer allows you create and optimize PDF output.
NiceFeather Software Solutions Corporation
The component is provides facilities to work with RGB, HSL, CMYK color models.
NOVOSIB Software Co.
Visual Color Picker is very useful and advanced color selector software.