jPDF Tweak is a Java Swing application that can combine, split, rotate, reorder, watermark, encrypt, sign, and otherwise tweak PDF files. Developed by Michael Schierl
License: Open Source
jPdf Tweak is a more user-friendly tool focused on basic PDF manipulation tasks, while PDFTK Builder offers more advanced features including command line support and form creation, making it suitable for users who require more complex PDF operations.