Open Tax Solver has been around for years and is still maintained and updated each year. https://opentaxsolver.sourceforge.net/ https://opentaxsolver.sourcefor

Open Tax Solver has been around for years and is still maintained and updated each year. https://opentaxsolver.sourceforge.net/ https://opentaxsolver.sourceforge.net/ The UI leaves a lot to be desired, but it does work and I used it one year.