Freeplane - Freeplane is a powerful and free software for building mind maps.

WriteNext - The writing application that boosts your writing. Increase focus and writing performance and reduce distractions by separating your creative writing from other activities. Let writing be the only activity you perform in the writing application.

vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.

Writebox - Writebox is a simple and distraction-free text editor for Chrome and iPhone/iPad.

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.

Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.