Hydrology & Modeling HexWatershed A mesh-independent flow direction and watershed delineation model for structured and unstructured grids PyFlowline A mesh-independent river network generator and topological framework for hydrologic models Geospatial Tools PyEarth A lightweight Python package to support data processing and geospatial workflows in Earth science Ecosystem Modeling ECO3D A three-dimensional process-based water and carbon cycle terrestrial ecosystem model implemented in C++ and OpenMP