GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Dr.Explain - Dr.Explain software is a help file authoring tool.
Docusaurus - Easy to maintain open source documentation websites
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
GraphQl Editor - Editor for GraphQL that lets you draw GraphQL schemas using visual nodes
MadCap Flare - Documentation for Any Audience, Language or Format