imprimatur

https://github.com/seuros/imprimatur

A Ruby DSL over a native core that writes Excel workbooks, and PDF and Word documents from one model, with its own XML, zip and PDF writers: no third-party format stack. It reads PDF, XLSX, XLS, ODS and DOCX back: as Markdown, as typed structure, and their images. Precompiled for Linux, macOS and FreeBSD; CRuby only.