JetBrains MPS

MPS (Meta Programming System) is an advanced language workbench and integrated development environment created by JetBrains that lets developers define, compose, and use domain-specific languages (DSLs) with rich tooling support. Unlike traditional text editors that treat code as plain text, MPS represents programs as structured models, enabling projectional editing where syntax, constraints, and semantics of DSLs are enforced by the editor itself, reducing parsing ambiguities and expanding expressiveness. Users can build custom languages tailored to specific problem domains and immediately get IDE benefits like intelligent completion, navigation, refactoring, type checking, and code generation for those languages. MPS also supports seamless integration between DSLs and general-purpose languages, allowing mixed projects where different parts are expressed in the most appropriate notation.