Flowfile

Flowfile is a visual ETL tool and Python library combining drag-and-drop workflows with Polars dataframes. Build data pipelines visually, define flows programmatically with a Polars-like API, and export to standalone Python code. Perfect for fast, intuitive data processing from development to production. Maintained by Edwardvaneechoud on GitHub, where it has earned 325 stars from the community.

It's actively developed around drag-and-drop, electron-app, etl, and is a solid reference for anyone building with these tools.