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.
UV Outliner - UV Outliner is a small and powerful single-pane outliner.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Freeplane - Freeplane is a powerful and free software for building mind maps.
Planka - Planka is an open source project management software similar to Trello.