ICIWaRM has developed a user-friendly software tool to perform regional frequency analyses with L-moments.  The tool is free of cost, but requires Microsoft Excel and ESRI ArcGIS or other similar GIS software.  The program provides the user with a range of distribution options as well as the ability to analyze various climate indices that may help the user to identify modes of climate variability that affect a particular region of interest. 

The software program and additional information can be found at the following site: http://www.iwr.usace.army.mil/Missions/Hydrology/ICIRAFT(ICIWaRMRegionalAnalysisofFrequencyT.aspx