Grammars for AddressBook entities: person names, company names, etc.

Grammars for food and drink entity names.

Grammars for geographic entities: countries, states, cities, ZIP codes, etc.

Grammars for jobs entities: titles, skills, acronyms, keywords, etc.

Grammars for Machine Learning entities: classifier names, classifier measures, etc.

Grammar and role for metadata entities: data types, column names, schema names, etc.

DSL-to-DSL translation with multiple DSLs.

EBNF grammar and interpreters.

A system of functional parsers (combinators, transformers, generators.)

LaTeX grammar and related interpreters (actions.)