This site hosts a plethora of useful links that are organized by sub topics under the umbrella of "multicultural." For example: literature, teaching tolerance, and ELL lessons on bridging the gap between groups of people.
This is a website that has many children's songs translated into many languages. It would be fun to use during a multicultural music study. It also has english translations, so it could be useful to do the same song in several languages as well.
This site is designed to provide teachers with strategies on how to build multicultural curriculum. It offers helpful steps on how to achieve this in any classroom setting.