[Document Editor APIs for .NET Open Source .NET Editor Libraries Effortlessly edit PDFs, DOC/DOCX, and XLS/XLSX in .NET apps using Free & Open Source Document Editor APIs. Document Editor APIs for .NET Include DocX Open source .NET DOCX library to create and edit DOCX documents. ExcelDataReader Open source .NET API to read XLS, XLSX, CSV and XLSB files. MimeKit Open source .NET Email library to create and edit MIME documents. ShapeCrawler Open source .NET PPTX API to create and edit PTPX presentations.]