Marimo is an open-source, AI-native, reactive development environment for Python, purpose-built for AI and data workloads. It reinvents the Python notebook as a reproducible, interactive, and shareable Python program, offering a Git-friendly environment that allows developers to move seamlessly from experimentation to production deployments. Marimo integrates with tools like DuckDB, Polars, and Pandas, and supports features like SQL cells and AI integration.