PDF Document Editors

PDF Slicer is a free and open source, simple program for editing PDF documents

Xournal++ is a free and open source, cross-platform program for creating handwritten notes and annotations in PDF documents

PDF Quirk is a simple free and open source software for easily creating PDF files from scanned documents or images

PDF Mix Tool is a free and open source simple software that allows you to split, merge, rotate and mix PDF files

PDFArranger – free and open source software that helps you merge or split PDF documents, as well as rotate, crop, and rearrange their pages

Krop – free and open source simple graphical tool to crop the pages of PDF files for Linux

PDFsam – free simple and open source cross platform software for splitting and merging PDF files