Covid Act Now
Covid Act Now is a volunteer-led web-based initiative to model COVID-19 data of the United States under different scenarios. It gives breakdowns of COVID-19 cases by state and county, along with projected changes due to measures these areas are currently taking. Projections forecast future cases, deaths, and needed hospital capacity.
The models used by Covid Act Now, also known as the US Interventions Model, are used by officials to decide on policies like shelter-in-place orders. The creators state that their "models err on the side of overestimation, not underestimation". The site is updated daily with the latest data on cases and countermeasures.