http://sourceforge.net/projects/helpmaker/
HelpMaker is a Help Authoring Tool to make WinHelp, HTML-Help, HTML-Website and PDF (i.e., manuals) files. HelpMaker is a fully functional graphical GUI help authoring tool written in Delphi. This is formerly commercial product, converted to open-source.
好像没看到生产chm
看到csdn开发高手近两期有介绍chm格式的文章