Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
Drift - A messaging app that helps you grow your business.
Dr.Explain - Dr.Explain software is a help file authoring tool.
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CHM Editor - Best solution to edit CHM files