FloPy
The Python interface to MODFLOW — build, run and post-process groundwater models entirely in code.
Analytic element groundwater modelling in Python — multi-layer steady flow with no grid at all.
Install
pip install timmlTimML, by Mark Bakker (TU Delft), models steady multi-layer groundwater flow with the analytic element method: wells, rivers, inhomogeneities and area sources are mathematical elements, the solution is exact everywhere, and there is no grid to design. A companion package, TTim, handles transient problems the same way.
For screening analyses, capture-zone estimates, dewatering first passes and teaching, this is often dramatically faster than setting up a gridded model — a well field takes minutes in a notebook. When heterogeneity gets serious you graduate to MODFLOW; TimML tells you whether you need to.
Other groundwater & hydrogeology tools covering similar workflow stages.
The Python interface to MODFLOW — build, run and post-process groundwater models entirely in code.
The USGS groundwater model — the world standard for aquifer simulation, rebuilt as a modular multi-model framework.
DHI's finite-element groundwater platform — unstructured meshes, density-driven flow, heat and mine dewatering.
Veteran commercial MODFLOW GUI with deep PEST integration — a consultant favourite for calibration-heavy work.
The standard for vadose-zone modelling — variably saturated flow and transport by Richards' equation.
USGS particle tracking for MODFLOW — pathlines, travel times and capture zones from flow solutions.