PDFpen - PDFpen is a PDF editor to add text, images, and signatures to PDFs.
RadaeePDF - RadaeePDF is a library for developers who want to render, manipulate, annotate PDF files on Android, iOS and Windows.
Adobe Reader - Adobe Acrobat Reader is a free tool for viewing documents that have been stored in Adobe's Portable Document Format (PDF).
SignRequest for G Suite - Sign yourself or get documents signed Easy, secure, legally binding and free. SignRequest helps you sign online.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
genei.io - AI-generated summaries for any article or research paper.