FloPy
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.
by US Geological Survey
MODFLOW 6 is the current core of the USGS's modular hydrologic model, in continuous development since 1984 and the reference against which groundwater software is judged. The 6.x framework couples multiple models in one simulation: structured or unstructured-grid flow (GWF), solute transport (GWT), energy transport (GWE), particle tracking (PRT), with advanced packages for streams, lakes, multi-aquifer wells and land subsidence.
It is public domain, rigorously documented and versioned, and virtually every regulator, court and reviewer on earth accepts it. Combined with FloPy for scripted model building, it forms the least-risk groundwater modelling stack available at any price.
Other groundwater & hydrogeology tools covering similar workflow stages.
The Python interface to MODFLOW — build, run and post-process groundwater models entirely in code.
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.
Multi-species solute transport for MODFLOW — advection, dispersion, sorption and reactions in aquifers.