boxwerk

https://github.com/dtcristo/boxwerk

Boxwerk is a tool for creating modular Ruby and Rails applications. It organizes code into packages with clear boundaries and explicit dependencies, enforcing them at runtime using Ruby::Box constant isolation. It reads standard Packwerk package.yml files (without requiring Packwerk), providing per-package gem isolation, Zeitwerk-based autoloading, monkey patch isolation between packages, and a CLI for running, testing, and inspecting your modular application.