pdfDocs is described as 'Integrates with business systems to efficiently assemble, secure and distribute documents in PDF and PDF/A format' and is a PDF Reader in the office & productivity category. There are more than 25 alternatives to pdfDocs for a variety of platforms, including Windows, Web-based, Mac, Android and iPhone apps. The best pdfDocs alternative is Foxit PDF Reader. It's not free, so if you're looking for a free alternative, you could try Foxit PDF Reader or Evince. Other great apps like pdfDocs are Firefox PDF Viewer (PDF.js), Adobe Acrobat DC, PDFCreator and Qoppa PDF Studio.