Apps with 'Tree structure' feature

  1. A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.
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  2. Workflowy lets you organise your brain into easily manageable lists. It also works as a single-pane outliner with inline notes. It offers one-click hoisting (zooming into branches). The online version syncs with mobile apps.
  4. Manuskript is an open-source tool for writers, with outliner, character management, plot development, distraction-free editor, etc. Outliner Organize your thoughts and snippets in a hierarchical manner. Organize them as you wish, reorganize them on the go.
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  5. A simple but effective way to keep on top of your tasks, 10 languages. ToDoList is a rare form of task management tool, one that allows you to repeatedly sub-divide your tasks into more manageable pieces whilst still presenting a clean and intuitive user experience.
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  6. Orgzly

    • Free • Open Source
    • Android
    • Android Tablet
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    You can keep notebooks stored in plain-text and have them synchronized with a directory on your mobile device, SD card, Dropbox, or over WebDAV.
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  7. wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information.

    Discontinued

    Last update was in November 2018, and various links are dead on their website.

  8. ACDSee is a complex, multi-purpose application that serves for viewing, organizing and editing digital photos. Furthermore, images can be shared on social websites or your own space on the developer’s website.
  9. Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.
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  10. A new medium for your ideas—augment your thinking with a text editor designed for structuring lists. Side-by-side views allow 3 modes of thinking.
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  11. KeyNote NF is a flexible, multi-featured tabbed notebook, based on Windows standard RichEdit control. It's always accessible with a single keypress, even if you work in another application.
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  12. novelWriter is a Markdown-like text editor designed for writing novels and larger projects of many smaller plain text documents. It uses its own flavor of Markdown that supports a meta data syntax for comments, synopsis and cross-referencing between files.
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  13. Sidewise Tree Style Tabs

    • Free • Proprietary
    • Mac
    • Windows
    • Linux
    • Google Chrome
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    A dockable sidebar for Chrome featuring vertical Tree Style Tabs, Tab Hibernation, and much more. * Tree Style Tabs: organize your tabs in a tree view. Supports ctrl/shift multiselect, drag & drop, instant search, right-click context menu, and more.
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  14. SynWrite

    • Free • Open Source
    • Windows
    • Total Commander
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    SynWrite is a free source code editor and notepad replacement for Microsoft Windows Operating Systems.

    Discontinued

    Last update was on 29-08-2017. Synwrite is continued on CudaText.
    Only there is no Total Commander plug-in with CudaText.

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  15. SmartEdit Writer (formerly Atomic Scribbler) is a project management and writing environment for novelists and short story writers working on Windows PCs.
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  16. MyInfo is free form personal information manager. It helps you collect, organize, edit, store, and later find personal-reference information like documents, random notes, and project-support materials.