HiOperator - HiOperator is a virtual assistant that answers phone calls, chats with customers, provides in-app help, takes orders, and provides support.
Dr.Explain - Dr.Explain software is a help file authoring tool.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
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.