PDF Mix Tool
- Merge two or more files specifying a page set for each of them;
- Rotate pages;
- Composite more pages onto a single one (N-up);
- Combinations of all of the above.
Besides, it can also mix files alternating their pages, generate booklets, add white pages to a PDF file, delete pages from a PDF file, extract pages
from a PDF file. It is written in C++ and depends only on Qt 5, qpdf and PoDoFo.