I replaced Docker with THIS.

Devbox is a CLI tool that creates reproducible development environments using the Nix package manager under the hood, but with significantly less complexity. It allows developers to specify project-specific package versions through a simple JSON configuration file, automatically activates environments when entering project directories via direnv integration, supports global package installation, includes plugins for common services like nginx and PostgreSQL, and provides npm-style run scripts without framework dependencies. The tool eliminates the need to juggle multiple version managers while avoiding Docker's overhead for local development.