Resources for users of the USGS-developed MODFLOW groundwater flow modeling package: online/downloadable tutorial, reference guide, lists of online MODFLOW resources vendors, and examples of input files.

Computer codes designed to model various ground-water and related hydrologic and geochemical processes and to help estimate related parameters.

For simulation of coupled non-isothermal (i.e., includes heat transfer equations) hydrologic transport and biogeochemical kinetic and/or equilibrium reactions in variably saturated media. 1-, 2-, or 3-dimensional.

Offers low-priced software for environmental and earth science professionals -- create boring logs, calculate hydraulic conductivity, create variogram plots.

Describes and offers a modular software package for modelling three-dimensional density-dependent groundwater flow, contaminant transport, and visualisation. Supports both finite element (Flairs) and finite difference (ModFlow) calculation methods.

Firm based in Germany offers groundwater simulation software and related training and support, as well as consulting in groundwater monitoring, management, and protection, surface water management and hydrology. Describes capabilities.

Finite element model for modeling saturated and unsaturated groundwater flow, density dependent groundwater flow, saltwater intrusion, contaminant transport and heat transport. Order online from Waterloo Hydrogeologic or request a demo.

Developer of software tools for groundwater modeling and aquifer test analysis.

Groundwater modeling software, services, and training, including sales and technical support for WinFlow, WinTran, MODFLOW-Win32, Groundwater Vistas, and AquiferWin32.

USGS's popular modular 3D finite-difference ground-water flow model, plus pre-processors, post-processors, and adaptations for contaminant transport, and air flow.