PDFsam, a desktop application to split, merge, mix, rotate PDF files
Prepress preparing tool and PDF editor
Python bindings for MuPDF's rendering library.
Document Management System and Content Management System
WorkerPDF is GUI for GhostScript created for PDF conversion
PDF Library for Developers
Full features for Dolphin's right click menu on KDE [4.x|5.x]
Application front-end PDFTK to manage operations on PDF files