Fast and easy to use cross-platform .NET library that creates or modifies Microsoft Word (DocX) and later also Excel (XLSX) files without installing any software. Library is based on Open XML SDK
Html2OpenXml is a small .Net library that convert simple or advanced HTML to plain OpenXml components. This program has started in 2009, initially to convert user's comments into templated Word.
Convert HTML to DOCX/PDF and edit DOCX/XLSX/PPTX from .NET. Pure managed - no native binaries, no browser, no LibreOffice. Runs on Linux, works offline.
Pure-Python reader/writer for VBA macros embedded in Excel / PowerPoint / Word files. Zero dependencies, deterministic round-trip, safe on protected and signed projects.
ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.