Free software that allows you to merge multiple pages of PDF documents into a single page.
Adobe Acrobat Reader allows you to view, comment, fill out, and sign PDFs on multiple platforms.
Free and open-source graphical interface for pdftk (PDF Toolkit), a command-line tool used to manipulate PDF files.
Free utility to convert PDF files, extract texts from PDF files, in addition to many other features.
Small utility that allows you to easily split pages of PDF files.
Free software to quickly and efficiently view, create, and edit PDF files.