jPDF Tweak is a Swiss Army Knife GUI application for PDF documents: combine, split, rotate, reorder (n-up, booklet), watermark, edit bookmarks/fileinfo/pagetransition, compress, encrypt, decrypt, sign, repair, edit attachments and more.
qvPDF is a PDF creator for Windows, but you can also merge & split. Its implemented as printer driver and uses plugins to execute different actions after creating the PDF.
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