The best substitute for Taleggio is the California "Franklin teleme." I am a big fan of Taleggio. When I lived in Milano in the Spring of 1961, it was served in restaurants as desert. I had never had that good a desert before in my life Limburger is not a strong cheese although is smells like it would be. Limburger is very flavorful in a mild manner.
Taleggio cheese is an Italian cheese made from cow's milk. It is pretty pungent and tangy. If you are unable to find it you can substitute with Fontina, Gouda, Gruyere or the very strong Limburger cheese.