Color charts for brown paints are available at BenjaminMoore.com, Behr.com and Glidden.com. Color charts are generally available from paint manufacturers and retailers covering the companies' product lines.
The paint manufacturer Sherwin-Williams offers a chart of its brown paint colors on Sherwin-Williams.com in its section for warm neutrals. Along with the color swatch, the site offers the name and identifying number for the color, and indicates whether the paint is designed for the exterior, interior or both. The Benjamin Moore color chart provides the same information, with a link to additional information about the color and collection, as well as directions on where to purchase the paint.