Tax calculators in the world

There are tax calculators for many countries, but almost none that accept multiple records are available outside the agency or beyond the author's institution. Taxsim is the only calculator with an API that I am aware of. Aside from Taxsim for the US, there are two I know of for other countries, and two others for the US.

Canadian Tax and Transfer Calculator This is a Stata program by Kevin Milligan of UBC)
GETTSIM (German Taxes and Trasfers System) is a Python program apparently by IZA (IZA)
A US Federal calculator in Python by the American Enterprise Institute (AEI). US (AEI)
PolicyEngine-USis a US Federal and State income tax calculator in Python by the PolicyEngine foundation.
Taxsim is a Fortran program for US Federal and State income taxes by Daniel Feenberg at the National Bureau of Economic Research

If you know of any others, please tell me. I wish to list any calculator that is available for others to use.

Interactive-only calculators.

There are a large number of interactive-only web-page based calculators for the United States. Daniel Feenberg feenberg@nber.org