Kchmviewer - Kchmviewer is a free, open-source CHM (MS HTML help) and EPUB viewer for Unix, Mac and Windows...
PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
WinCHM - Creating CHM file, Make CHM file, Web Help. WinCHM Pro - Help authoring software (CHM, WebHelp, DOC, PDF) . With this powerful tool you can not only create chm file from scratch, but also convert a set of existing HTML files to a chm file.
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
ExtraCHM - A fully featured reader for Compiled HTML (chm) documents.
PDFill - Open, View, Edit, Save and Print PDF Documents without Adobe Acrobat