PDFium is described as 'is Google's PDF generation and rendering library. It's used in Chrome for displaying PDFs and print preview and on Android for PDF rendering' and is an app in the Development category. There are more than 10 alternatives to PDFium for a variety of platforms, including Windows, Online / Web-based, Linux, Mac and Self-Hosted solutions. The best alternative is Document Cyborg, which is free. Other great apps like PDFium are HTML to PDF Converter Library for .NET (Paid), Pdfcrowd (Paid), PDFSwitch (Free Personal) and HTML2PDF (Free).
PDFSwitch is a high-quality, easy to implement HTML to PDF conversion API. Easily generate PDF invoices, tickets, reports and documents with HTML to PDF API. Lightning-fast service, rich features, code samples for Java, C#, PHP, Python, Ruby, Go, Nodejs.
HTML2PDF is a HTML to PDF converter that allows the conversion of valid HTML 4.01 in PDF format, and is distributed under LGPL. This library has been made to assist in the creation of PDF files, not to directly convert an HTML page.
The Apache PDFBox™ library is an open source Java tool for working with PDF documents. This project allows creation of new PDF documents, manipulation of existing documents and the ability to extract content from documents.