People are collecting and aggregating data in many different ways. These are the sites that I find most interesting:
COVID-19 Projections
Projection of cases vs. required resources.
COVID ActNow
Like COVID-19 Projections, but with best/worst case scenarios.
Covid by County
Compare growth rates across US counties.
91-DIVOC
Visualization of exponential spread.
The COVID Tracking Project
Test results for each state.