1. Computer-readable media embodying instructions executable by a computer to: provide a first class library comprising a first plurality of classes of a first language; provide a second class library comprising a second plurality of classes of the first language each containing one or more of the first plurality of classes of the first language; provide a third class library comprising a first plurality of classes of a second language; provide a fourth class library comprising a second plurality of classes of the second language each containing one or more of the first plurality of classes of the second language; receive source code of the first language defining a third plurality of classes of the first language, one or more calls to one or more of the first plurality of classes of the first language, and one or more calls to one or more of the second plurality of classes of the first language; translate the third plurality of classes of the first language into a third plurality of classes of the second language; translate the calls to the first plurality of classes of the first language into calls to the third class library without modifying the calls to the second plurality of classes of the first language; and generate intermediate language code based on the second plurality of classes of the second language, the calls to the third class library, the calls to the second plurality of classes of the first language, the fourth class library, and the third class library, wherein the calls to the first plurality of classes of the first language comprise calls to object classes or string classes or both, wherein the source code of the first language relies upon classes of the first class library, wherein the source code of the second language relies upon classes of the third class library, wherein the second plurality of classes of the first language normalize the interfaces of the classes of the first class library, and wherein the second plurality of classes of the second language normalize the interfaces of the classes of the third class library, wherein the fourth class library is such that classes of the fourth class library have the same method signatures as corresponding classes in the second class library, and wherein the translation of source code of the first language into source code of the second language does not require the translation of the second class library, but instead calls to a class of the second class library become calls to a corresponding class in the fourth class library with the same method signature.