Geotechnical and Geoenvironmental Software Directory  
   A software directory of programs for geotechnical, geoenvironmental and environmental engineering; hydrogeology, geology, geoscience, data analysis and data visualisation.
   http://www.ggsd.com/

GroundwaterSoftware.com  
   Purchase groundwater software now and download immediately at discounted prices. Many applications available: flow and transport modeling, slope stability analysis, landfill design, and geostatistics.
   http://www.GroundwaterSoftware.com/

IGWMC Groundwater Modeling Software  
   International Ground-Water Modeling Center distributes a large number of practical, public domain and proprietary ground-water programs, ranging from codes based on simple analytical solutions to those incorporating advanced and complex numerical techni
   http://www.mines.edu/research/igwmc/software/

USGS Ground-Water Software  
   Computer codes designed to model various ground-water and related hydrologic and geochemical processes and to help estimate related parameters.
   http://water.usgs.gov/nrp/gwsoftware/

MODFLOW and related programs  
   USGS's popular modular 3D finite-difference ground-water flow model, plus pre-processors, post-processors, and adaptations for contaminant transport, and air flow.
   http://water.usgs.gov/nrp/gwsoftware/modflow.html

Reaction-Transport Modeling In Ground-Water Systems  
   USGS aqueous geochemistry codes, including PHREEQ (Speciation, Reaction-Path, Advective Transport, and Inverse Geochemical Calculations) and NETPATH (Interactive Code For Modeling Net Geochemical Reactions Along a Flow Path).
   http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/

HydroBioGeoChem 123D  
   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.
   http://hbgc.esd.ornl.gov/

Gaea Technologies  
   Software for geoscience and engineering applications, including boring and well logs, grain size analysis, and 1.5- and 2-dimensional contaminant transport modeling.
   http://www.gaea.ca/

MicroFEM Groundwater Flow Modeling  
   Offers several programs for applications including multiple-aquifer steady-state and transient flow, aquifer test analysis, and interpretation of geo-electrical measurements with Schlumberger or Wenner configurations. Downloads available.
   http://www.microfem.com/

Interactive website for groundwater calculations, software, and equations  
   LMNO Engineering, Research, and Software, Ltd., website has interactive calculations for groundwater flow and contaminant transport.
   http://www.LMNOeng.com/Groundwater

FEFLOW  
   A finite-element simulation package for 3D and 2D density-dependent flow, mass and heat transport processes in groundwater and in the unsaturated soil. Description, pricing, and downloadable demo, from WASY Ltd.
   http://www.feflow.info

EasySolve Software LLC  
   Offers low-priced software for environmental and earth science professionals -- create boring logs, calculate hydraulic conductivity, create variogram plots.
   http://www.easysolve.com/

WASY Ltd.  
   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.
   http://www.wasy.de/english/

Geolink Hydrogeology  
   Download GIS GeoLink 2.0 a powerful general-purpose geographic information system designed for solving hydrogeological, cartographic, referential, statistical and environmental problems. Also offers off-shore software development, consulting services in
   http://www.geolink-ltd.com

Environmental Simulations, Inc.  
   Groundwater modeling software, services, and training, including sales and technical support for WinFlow, WinTran, MODFLOW-Win32, Groundwater Vistas, and AquiferWin32.
   http://www.groundwatermodels.com/

HydroSOLVE, Inc.  
   Developer of software tools for groundwater modeling and aquifer test analysis.
   http://www.aqtesolv.com/

Streamline Groundwater Applications, Inc.  
   Develops applications to help hydrogeologists analyze aquifer tests and design effective aquifer remediation systems.
   http://www.streamlinegwa.com/

Water Resource Associates Ltd  
   Offers analytical, modelling, and software development skills for hydrology, water resources, groundwater, and water quality.
   http://www.watres.com/

Argus Open Numerical Environments  
   A family of general purpose public-domain graphical pre- and post-processors for the numerical modeler, combining GIS and numerical modeling. Includes plug-in extensions for the most widely used groundwater models, including
   http://www.argusint.com/index.html

Geocosm  
   Specialists in applying and developing technology for modeling sandstone diagenesis and petrophysics, in connection with sandstone permeability/porosity and reservoir quality.
   http://www.geocosm.net/

Waterloo Hydrogeologic  
   Develops and sells groundwater and environmental software for groundwater modeling, subsurface visualization, pumping test analysis, geochemistry, and natural attenuation and risk assessment. Products include Visual MODFLOW, AquiferTest, Visual Grou
   http://www.waterloohydrogeologic.com/

Ground Water for Windows Software  
   Software combines a relational data base and a Ground Water Information System (GWIS). Applications include mapping, well logs, aquifer test analysis, and plotting of water chemistry data.
   http://www.geocities.com/karanjac

The MODFLOW help file  
   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.
   http://www.mindspring.com/~rbwinston/modhelp.htm

Groundwater Modeling System Resource Center  
   Resources for users of GMS, which integrates popular models such as MODFLOW, MODPATH, MT3Dms, RT3D, FEMWATER and SEEP2D. Free downloadable resources and examples.
   http://gms.watermodeling.org/

BOSS International Groundwater Modeling Products  
   Offers GMS, FEFLOW, and other groundwater software programs. Also has products for hydraulics and surface water hydrology.
   http://www.bossintl.com/html/groundwater_modeling_products.html

Geotrans Groundwater Software  
   Software packages for groundwater flow, transport modeling, GIS and data management.
   http://www.geotransinc.com/software.html

Triwaco  
   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.
   http://www.triwaco.com

Sanitas for Groundwater Statistical Software  
   Demo and sales of Windows software for statistical analyses of groundwater monitoring data required by the US RCRA statute.
   http://idt.nicusa.com/sanitas/sanitas.html

Ecoseal Developments Pty Ltd  
   Provides software, groundwater monitoring equipment, and magnetic instruments for environmental, agriculture, mining and education sectors.
   http://www.ecoseal.com

EarthSoft, Inc.  
   Producer of EQuIS Geology and EQuIS Chemistry for storage and reporting of geologic and groundwater data. Numerous interfaces to other vendors' visualization codes enhance the utility of these database products.
   http://www.earthsoft.com

mView Numeric Modeling Support System  
   Visual pre- and post-processor for groundwater modeling, supporting numerous modeling codes including TOUGH, FEHM, NUFT, ASHPLUME, WAPDEG, MODFLOW/MODPATH, FRAC3DVS and SWIFT.
   http://www.interaeng.ca/tech_mview.htm

C Tech Development Corporation  
   Producer of EVS Environmental Visualization System, with applications in groundwater characterization and visualization and links to modeling codes.
   http://www.ctech.com

Hydrus-2D  
   A software package for simulating two-dimensional movement of water, heat, and multiple solutes in variably saturated media.
   http://www.hydrus2d.com

Hydrologic Modeling Technology  
   Producer of ModTech, groundwater flow and contaminant transport simulation code with integrated geographic information system functionality.
   http://www.modtech-gw.com

Environmental Insite  
   3d groundwater visualization application for analysis and communication of environmental groundwater data. Capabilities include mapping, 2d/3d contouring, pie charts, time history charting, radial diagrams and database queries.
   http://www.enviroinsite.com

Discerning Systems Inc.  
   Hydrogeochemical exploratory and statistical tools for analysis and management of monitoring data at landfills and industrial facilities.
   http://www.discerningsystems.com