PDF-ShellTools is described as 'Interact with your PDF documents directly from the Windows Shell!' and is an app in the File Management category. There are three alternatives to PDF-ShellTools for Windows, Linux, Mac and Online / Web-based. The best alternative is PDFsam, which is both free and Open Source. Other great apps like PDF-ShellTools are PDF24 Tools (Free) and PDF Mixer (Free).
PDFsam Basic is a free, open source, multi-platform software designed to: * Merge PDF files (the entire documents or selected page ranges), retaining or discarding bookmarks, acroforms and generating or not a table of contents.
PDF Mixer is a PDF page tool which mixes pages of 2 or more PDF files, add PDF pages into existing PDF files and save them to a new file. With this powerful tool, you can reorder, copy, rotate, delete, switch and merge pages in multiple PDFs easily.