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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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copypastetaxes
An open source tax engine so all Americans can do their taxes using simple copy and paste
Computing tax
Noticed this comment.
https://github.com/thegrims/UsTaxes/blob/master/src/irsForms...
I wrote some python a few years ago for this purpose
https://github.com/adsharma/tax
You could just reuse the code from opentaxsolver and run it through emscripten. Here's an old version I made a few years ago: https://github.com/jfim/1040.js
If you read french or can dive in the mostly-english code, you can fork https://github.com/betagouv/mon-entreprise.
It doesn't fill tax forms, but it's a set of simulations and a framework to write more models and generate UIs automatically.
Love it!
I have a technology that will be really useful for disrupting tax filing in USA.
Basic pitch is here: https://github.com/breck7/copypastetaxes
I'd be interesting in talking about some type of collaboration if you're interested in chatting! Email is in profile.