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• CSIRO Land and Water in Adelaide, Australia
• CSMoS (USEPA) The Center for Subsurface Modeling Support provides a source for publicly available groundwater and vadose zone modelling software.
• Das Deutsche Klimarechenzentrum (DKRZ) The DKRZ located in Hamburg is the Service Center for Climate Researchers in Germany. You can find a lot of interesting software, including visulization packages.
• Hydrologic Engineering Center. This is an office of the US Army Corps of Engineers established to support hydrologic engineering and water resources planning and management. You can download HEC software here.
• USGS Water Resources Applications Software. This is a big treasury for many modelers.

• IGWMC International Ground Water Modeling Center at the Colorado School of Mines. This center provides software and training courses.
• Institut für Hydromechanik und Wasserwirtschaft (IHW) der ETH Zürich (Switzerland). This page provides free software, including ASM, PMPATH 98, ASMWIN, CATTI, TBC and computer program for the Simulation of Activated Sludge Systems ASIM.
• National Water Research Institute of Environment Canada.
• Stanford Center for Reservoir Forecasting. Home of GSLIB - Geostatistical Software Library and User's Guide". Provide free software, such as 3D-Kriging.
• University of Alabama. Free MT3D resources at the University of Alabama. You can find a free MT3D Version DOD_1.5 and MT3DMS here. The new MT3DMS works with PMWIN 5.x.
• University of Massachusetts (Dept of Civil and Environmental Engineering). This page provides free groundwater management software MODOFC.
• UNCERT developed by the Dept. of Geology and Geological Engineering of CSM A geostatistical uncertainty analysis package applied to groundwater flow and contaminant transport modelling.
  

• Aqtesolv: Home of AQTESOLV, an all-in-one package for the analysis of pumping tests, slug tests and single-well tests.
• Integrated Environmental Service, Inc. Provides desktop and web-based products for rapid and easy access to complex environmental and/or geospatial data. It also sells PMWINPro (7.0) and 3D Master.
• Scientific Software Group Here you can find a lot of MODFLOW related software and software for hydrology, air pollution and geology
• Simcore Software New home of Processing Modflow, you can purchase Processing Modflow and the new 3D Visualization package Seer3D here.
• S. S. Papadopulos You can download software from SSPA, e.g. MT3D.
• Watermark Computing Visit and get more about PEST here.

• Bioremediation Discussion Group home page
• Groundwater Mailing List home page
• Watermodeling.org This site is a resource for finding answers and asking questions about hydraulic engineering and hydrology computer modelling issues.

• CNET Download.com
• DaveCentral Software Archive
• Freeware
• Shareware.com
• The FreeSite
• Tucows home page
• Winsite home page
• ZdNet