OpenNSPECT
OpenNSPECT, an open-source version of the Nonpoint-Source Pollution and Erosion Comparison Tool (N-SPECT), is a plugin to the free MapWindow GIS open-source platform. Enhancements in this version of N-SPECT include faster processing time, additional coefficients for common land cover data products, and a comparison function to evaluate differences in land use scenarios.
The previous versions of N-SPECT are compatible with ESRI ArcGIS versions 8.3 and 9.0-9.2. N-SPECT for ArcGIS version 10.x will not be developed by NOAA.