Dr.Explain - Dr.Explain software is a help file authoring tool.
Stonly Knowledge Base - Interactive knowledge bases and help-centers
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
Free Knowledge Base by Dashly - Optimize your customer support with Knowledge Base by Dashly
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.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.