It's a system for building, managing, and publishing content for JavaHelp system
Helen is a user-friendly system for building, managing, and publishing content for JavaHelp systems:
-Helen includes a WYSIWYG HTML editor
-Produces excellent JavaHelp output
-Import of existing JavaHelpTM helpsets
-Project consistency checker
-HTML link checker
-Designed exclusively for JavaHelp
-Export of a single PDF document for the complete HelpSet