Anderson-Hydro
   Offers the arid lands hydrology model (AHYMO) program for computing hydrographs and sediment yield in applications such as analysis of storm sewers.
   http://www.ahymo.com/

BOSS International
   Catalog of software for solving problems in hydrology, hydraulics, surface water or groundwater modeling, regional watershed hydrology, water distribution, stormwater, wastewater, and terrain modeling.
   http://www.bossintl.com/html/products.html

CatchmentSIM Software
   Free GIS based catchment parameterization and flood modeling software with DEM orientated hydrologic rainfall runoff model.
   http://www.toolkit.net.au/catchsim

Environmental Modeling Systems, Inc
   GMS, SMS & WMS, provide user-friendly, graphical user interfaces for industry-standard numerical models in groundwater, surface-water, and watershed modeling applications.
   http://www.ems-i.com/

FLOWatch
   Operations software for data monitoring and analytical services for water treatment plants using membrane technology.
   http://www.flowatch.com/

Hydromantis Inc.
   Offers GPS-X software, a modeling and simulation software for wastewater treatment plants.
   http://www.hydromantis.com/

Linko Industrial Pretreatment Software
   Modular software for industrial pretreatment tracking.
   http://www.linkoweb.com/

Municipal Solutions Ltd.
   Manufacturer and supplier of access control hardware and billing software for bulk water truck fill stations and wastewater/septage receiving stations.
   http://www.municipal-solutions.com/

RGM HEC2000
   Offers Windows based interactive graphical interface software for HEC-1, used for storm water, water resources, water quality and flood flow computations.
   http://www.hec1.com/

StormTac
   Watershed-based Excel model for quantification of material transport by stormwater and design of stormwater treatment facilities.
   http://www.stormtac.com/

The WRCS Hydrology and Hydraulics Software Shop
   Describes and distributes a large collection of commercial, government-issue, and free water resources modeling programs and utilities, including US Army Corps of Engineers HEC programs.
   http://www.waterengr.com/

USGS Water Resources Applications Software
   Hydrologic and hydraulic modeling and analysis programs in geochemical, ground water, surface water, and water quality categories. Programs include PHREEQC, NETPATH, MODFLOW, MOC, SUTRA, FEQ, HSPF, GenScn, PeakFq, SWStat, and BLTM.
   http://water.usgs.gov/software/

WaterCom Engineering
   Offers software and computational and consulting services for hydrology, hydraulics, and related applications. Offers a CD with a large collection of useful programs.
   http://www.watercom.ca/

WaterWare: Water Resources Management Information System
   Decision support software from Environmental Software and Services GmbH.
   http://www.ess.co.at/WATERWARE/