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Program to create non-Word or Excel PDFs.
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.
Free software for Windows that allows scanning and saving documents in PDF format.

Utility to extract and merge pages from PDF files.
Lightweight, fast, and open-source PDF viewer and toolkit that allows rendering PDF, XPS, and other formats with high fidelity and performance.