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

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/

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/

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/

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

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

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/

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/

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

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

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

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/