Adobe Acrobat Reader allows you to view, comment, fill out, and sign PDFs on multiple platforms.
Free software for Windows that allows scanning and saving documents in PDF format.
Free and open-source graphical interface for pdftk (PDF Toolkit), a command-line tool used to manipulate PDF files.
Create PDF files from virtually any application.
Free software that allows you to merge multiple pages of PDF documents into a single page.
Advanced PDF editing solution that offers a wide range of features.