Tools include full GUIs such as Model Muse or FREEWAT as well as tools for building, updating, and analyzing model results for specific packages or features. Hydrologic budgets and tools to facilitate temporally self-updating models are also available along with training and design guidance fro builds, calibration, analysis, and hydrologic budgets. All USGS model and GUIs and climate Toolkit are free software. FREEWAT developed for the European Union is also free software. The two Conjunctive Water Management books and Example-Model Exercises are also free from John Cherry’s Groundwater Project.