asposepdfcloud
Aspose.PDF Cloud is a REST API for creating and editing PDF files. Most popular features proposed by Aspose.PDF Cloud: PDF to Word, Convert PDF to Image, Merge PDF, Split PDF, Add Images to PDF, Rotate PDF. It can also be used to convert PDF files to diff
office-converter
A Conversion utility library for Office Files into PDF/HTML using https://github.com/dagwieers/unoconv