SWAT Soil and Water Assesment Tool

Description:	SWAT is a software extension that can be used for modeling watersheds and rivers to assist in land management. SWAT can be downloaded for ArcGIS or QGIS and has a myriad of other data and tools for download.
Software type:	Extension
Website:	https://swat.tamu.edu/
Accessibility:	Install only
Computer System:	Windows, Linux
Scope:	Modelling, Visualisation
Costs:	Free
Tutorials:	http://swat.tamu.edu/documentation/