Dr.Explain - Dr.Explain software is a help file authoring tool.
PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
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.
PDFChef Merge PDF - PDFChef Merge PDF is an online tool that allows you to merge multiple PDf files into one quickly and securely.