"Your software is the best I've ever used for comparing PDFs.",
—Customer comments on DiffPDF & diffpdfc
DiffPDF is a Windows graphical user interface (GUI) application for comparing PDF files and showing any differences.
diffpdfc is a console (command line) program for Windows for comparing PDF files and reporting any differences.
XindeX — easy to learn and use software for creating, editing, and outputting indexes (e.g., for books).