PDF-Shuffler, PDFtk, PDF-Tools, PortableSigner, PDF Stapler, Wide Angle PDF Converter, PDF Mix Tool, PDF Import for Apache OpenOffice, UnityPDF, iCombiner, Combine PDF, PDF to PDF, PDF Joiner, pdfslicer, OnMerge Images+Barcodes, Free Combine PDF 4dots, PDF Merge (Beta), PDF Separator, Ultra PDF Merger, PDF Nomad, Couturier are some alternatives to PdfMod.