Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
CHM Editor - Best solution to edit CHM files
AlReader - Alreader.com - new perspective on reading e-books.
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.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Microsoft HTML Help - Microsoft HTML Help is the standard help system for the Windows platform.