docx4j.NET (nuget): docx4j is an open source (ASLv2) Java library for docx/pptx/xlsx, similar in concept to Open XML SDK, but with its own particular strengths including content control databinding (with OpenDoPE enhancements),      XHTML import/export, PDF output, and MERGEFIELD processing.  This is the .NET version of docx4j.
Keywords: docx4j|docx|pptx|xlsx|OpenXML|PDF|HTML|mailmerge|MERGEFIELD|content|control|data|binding