Qpdf Tools
Qpdf Tools is a free and open source, easy-to-use Qt interface for Ghostscript and Stapler
Vector Slicer
Vector Slicer is a free and open source simple application for exporting SVG parts as individual pages to a multi-page PDF file.
Master PDF Editor
Master PDF Editor is a free and multi-platform, easy-to-use, but powerful and multifunctional program for working with PDF documents
PDF Slicer
PDF Slicer is a free and open source, simple program for editing PDF documents
Xournal++
Xournal++ is a free and open source, cross-platform program for creating handwritten notes and annotations in PDF documents
PDF Quirk
PDF Quirk is a simple free and open source software for easily creating PDF files from scanned documents or images
PDF Mix Tool
PDF Mix Tool is a free and open source simple software that allows you to split, merge, rotate and mix PDF files
PDFArranger
PDFArranger – free and open source software that helps you merge or split PDF documents, as well as rotate, crop, and rearrange their pages
Krop
Krop – free and open source simple graphical tool to crop the pages of PDF files for Linux