MuPDF

MuPDF combines a simple visual editor with formidable command-line capabilities. You can quickly create, view, or annotate PDFs through its intuitive interface, while the integrated command-line client unlocks advanced features for document conversion, extraction, and batch editing. This dual approach caters to both casual users and technical professionals needing automation. Its open-source nature and lack of cost make it a versatile and powerful addition to any toolkit for managing PDF documents efficiently.