Download Geoserver 2.12.1 Server
GeoServer is an open source server for sharing geospatial data.
Download ILWIS Open 4 Software
ILWIS (The Integrated Land and Water Information System) is a remote sensing and GIS software which integrates image, vector and thematic data in one unique and powerful package.
gvSIG Desktop 2.4
gvSIG Desktop 2.4, the new version of the open source Geographic Information System,
Hydrologic Engineering Center's - River Analysis System (HEC-RAS) 5.0
This software allows the user to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling.
Get HEC-RAS User's Manual from tutorials page.
Free Software & Tools
QGIS is a professional GIS application that is built on top of and proud to be itself Free and Open Source Software (FOSS).