Affinity Publisher - Professional desktop publishing app
Freeplane - Freeplane is a powerful and free software for building mind maps.
Contenta Publishing Suite - Contenta Publishing Suite is an advanced-level and web-based publishing software solution offered by RWS that allows you to create good quality content and offers you optimized steps and procedures to publish the content successfully.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
RebelMouse - Publishing platform for distributed content
SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.