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A couple of years ago we looked at jupiterone but didn't get it. It might do what you want but their platform isn't open source if that's important.
https://github.com/JupiterOne/security-policy-builder
https://github.com/JupiterOne/security-policy-templates
Since so much with compliance documentation is repeated I wanted something with 'subdocuments' that could be managed individually and 'compiled' into a document, with cross references to standards to make it easy for auditors. This might do it, didn't pursue it far enough to find out.