In response to COVID-19 and other pandemics, a collaboration between George Mason University, The World Bank, and Johns Hopkins University have developed a portal that supports Models for Assessing Strategies for Hospitals (MASH). MASH-Pandemics ExtendSim models can be used for a range of what-if analyses for hospitals and groups of hospitals. They help provide recommendations under realistic operating conditions, including the COVID-19 outbreak. The models quantify the potential benefits of increasing hospital capacity by applying different strategies, changing how staffing and inventory are managed, adjusting how patients are triaged when they arrive, and taking other adaptive measures.