It's a piece of software I've developed that is not publicly released, but eventually will be and will be AGPL3.
A few other people have also written such software. One guy still maintains it and surprisingly wrote a whole IRS / 1040 library in C. Mine is more oriented towards business and employer related taxes, though, than personal / investment sort of tax forms (although it will do the latter).
Biggest weakness is it will only support 1 or 2 states because I don't have the resources to make an accurate system for all 50.
A few other people have also written such software. One guy still maintains it and surprisingly wrote a whole IRS / 1040 library in C. Mine is more oriented towards business and employer related taxes, though, than personal / investment sort of tax forms (although it will do the latter).
Biggest weakness is it will only support 1 or 2 states because I don't have the resources to make an accurate system for all 50.