LibreOffice Viewer - The Document Foundation provides a LibreOffice Viewer for Android.
Doczilla - Effortlessly create stunning PDFs and screenshots. Seamlessly store them in your own AWS or Google Cloud Storage bucket, putting the control and creativity right at your fingertips.
Cisdem DocumentReader - Need to read mutiple windows documents on Mac? Cisdem Document Reader is the all in one solution to read WPD, WPS, XPS, OXPS, VISIO, DjVu, PDF, Winmail.dat files on Mac. Try it now!
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
OpenDocument Reader - OpenOffice Document Reader is an Android OpenOffice and LibreOffice Document Reader!
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more