Adobe Acrobat Reader allows you to view, comment, fill out, and sign PDFs on multiple platforms.

Utility to extract and merge pages from PDF files.
Free software that allows you to merge multiple pages of PDF documents into a single page.
Free utility to convert PDF files, extract texts from PDF files, in addition to many other features.
Program to create non-Word or Excel PDFs.
Software that offers a practical solution for managing and editing PDF files.