Here are some standard colour links:

 

Pantone colour search:

http://www.pantone.com/pages/pantone/colorfinder.aspx

 

Pantone North America:

http://www.pantone.com/pages/pantone/index.aspx

 

RAL Colour:

http://www.ralcolours.com/

 

RAL Colour Chart:

http://ralcolor.net/