WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Dr.Explain - Dr.Explain software is a help file authoring tool.
Pendo - Pendo helps product teams understand and guide users to create product experiences that customers love.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
Gotcha - User-centric analytics & triggers, driven by micro-surveys
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.