Open source PDF editor
The universal markup converter
A PDF processor written in Go
A Privacy First PDF Toolkit
PDFCraft is a free, privacy-focused PDF toolkit
Cross-platform SDK for creating and modifying PDF documents
Gerber to PDF converter
converts PostScript or PDF files to other vector graphics formats
Split and merge PDF files on any platform
PDF transformation/manipulation program + library
High Volume Variable Data Printing & Mail Merge in PDF format
Scan documents to PDF and other file types, as simply as possible.
GUI to set PDF initial view using Ghostscript on Windows
a graphical user interface for the PDF Toolkit (PDFtk)
Edit your PDFs without needing a subscription or creating accounts
GUI for updating PDF bookmarks using PDF Toolkit (PDFtk) on Windows
Convert HTML to PDF using Webkit (QtWebKit)
A free open source tool for generating 4-up slides from a PDF document
Convert files with output for dot-matrix printer into PDF
Create PDF from JPEG scans and photos
PDF Concatenation Tool
Convert pdf to a djvu using profiles with all options of pdf2djvu