Saez and Zucman have a tax plan creator on the website for their book, “The Triumph of Injustice.”
It lets users play with wealth, personal income, corporate, and estate taxes, and also change assumptions around healthcare.
It also includes presets for the Biden, Sanders, and Warren plans, as well as their own plan.
The output is a graph with the effective tax rate by percentile (and the top 400, like the NYT piece). I don’t believe it’s open-source like their wealthtaxsimulator.org is.