stefan.seeland 

PdfAValidator is based on VeraPdf and is an open source conformance checker for PDF/A files. It is designed to help archives and libraries check that their PDF/A collections conform to the appropriate ISO 19005 archiving standard specification.

Compares Images and calculates mean error, absolute error and diff image. Supports optional tolerance mask/images to ignore areas of an image. Use this for automated visual comparing in your unit tests.

You need to decode, encode or do some processing stuff on multimedia streams, files or whatever mencoder can read? You want to implement your solution in C# or some other .net language? Here you are! This is an assembly which wrappes calls to e.g. reencode some source with a other codec.

The Open XML SDK provides tools for working with Office Word, Excel, and PowerPoint documents. This version is a fork focusing on current .net versions.

Mp4BoxSharp is a wrapper for Mp4Box from http://gpac.wp.mines-telecom.fr/mp4box/

iTextSharp.LGPLv2.Core is an unofficial port of the last LGPL version of the iTextSharp (V4.1.6) to .NET Core.

Pdfjs for .net

Compares Images and calculates mean error, absolute error and diff image. Supports optional tolerance mask/images to ignore areas of an image. Use this for automated visual comparing in your unit tests.

Converts docx to html without the need to setup any dependency

Renders HTML to PNG or PDF, supports windows and linux

Postscript validator does some basic validation of postscript files.

PdfToPdfA1b is a .net standard assembly capable to add PdfA-1b meta data to an existing Pdf.