Manuskript - Open-source tool for writers.
Freeplane - Freeplane is a powerful and free software for building mind maps.
BlankPage - Stay motivated to write, and finish your story
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
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.