GSView Alternatives

PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.

PDFTools

As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more

Try for free paid Free Trial $15.0 / Monthly (125+ Documents)

QPDF is a command-line program that does structural, content-preserving transformations on PDF...

Open Source

PyPDF2 - A utility to read and write pdfs with Python

iSafePDF is a free open source PDF protection software.

A free site that lets you remove passwords and restrictions (such as printing, copying text, etc.

For 9.99 $ A-PDF Restrictions Remover is extremely easy to use.

PDFsam Basic, a free, open source, multi-platform software designed to split, merge, extract pages, mix and rotate PDF files

Open Source free

PDF Password Remover Tool. Free PDF password remover tool by PDF Technologies. Remove passwords from PDF documents.

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.

Advanced PDF Utilities Free helps deal with PDF files such as to merge or split pages, convert PDF to text & convert image to PDF or vice versa.

Locklizard Safeguard PDF Security provides total PDF DRM protection and control over your documents...

paid Free Trial

PDFtk is a simple tool for doing everyday things with PDF documents.