Domain Specific Languages

ANTLR, ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages. ANTLR provides excellent support for tree construction, tree walking, translation, error recovery, and error reporting.

PDF book on Antlr is reported to be worthwhile.

"Oslo" is the code name for Microsoft's platform for model-driven applications. The goal of "Oslo" is to provide a 10x productivity gain by making model-driven applications mainstream with domain-specific models, a new language, and tools.