Markdown Viewer - Markdown document viewer. Allows to visualize formatted markdown documents in browser.
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.
Markdown Preview for (Neo)vim - Preview markdown on your modern browser with synchronized scrolling and flexible configuration.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Freeplane - Freeplane is a powerful and free software for building mind maps.