Is there a place where I can match colors of different brands of paint?

I have a glidden color (the little printout you get on the can with the exact color) and I want to be able to match it to a sherwin williams color. Any ideas, besides the computer match system at the store--is there a tool on the web?Is there a place where I can match colors of different brands of paint?
All paint shops have a color analyzer that will match any color to their brand,so you free to get the brand you like.Good LuckIs there a place where I can match colors of different brands of paint?
try to find more colour shops like asian paints or nerolac colour shops. they will give u exact colour sample