Dr.Explain - Dr.Explain software is a help file authoring tool.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
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.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
Slack - A messaging app for teams who see through the Earth!