There are several utility programs that have been created to assist in setting up GSSHA simulations, in addition to WMS.
CleanDam is a utility that tries to fix digital dams in an elevation grid file.
Format_Precip is an ExcelR spreadsheet that assists in formatting gage data into the GSSHATM precipitation file format.
Format_Hmet is an ExcelR spreadsheet that assists in formatting hydrometeorological data into a format usable by GSSHATM.
The Time Series Data Editor is a program that assists in formatting both hydrometeorological and precipitation gage data into a format usable by GSSHATM.
If you have developed other utility programs and want to share them, you may feel free to add a link here describing the program with a link to download it.