Hydra is an implementation of the LambdaGraph data model, which takes advantage of an isomorphism between labeled hypergraphs and typed lambda calculus: in Hydra, "graphs are programs, and programs are graphs". The language is designed to be embedded in other programming languages -- currently Haskell, Java, and Python. Hydra transforms data, schemas, and functional programs into multiple other languages in a way which maintains type safety. It is mutually self-hosting in Haskell, Java, and Python; i.e. each Hydra compiler can generate each other Hydra compiler as well as itself.