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A notebook app for Mac, iPad, and iPhone with hierarchical pages, handwriting, and cloud sync.

A Windows note organizer with hierarchical notebooks, varied note types, and full-text retrieval.

Keep rich-text or code notes in a hierarchical tree stored in a single database or file collection.

A transactional hierarchical key-value database with interfaces for multiple programming languages.

Build a hierarchical personal knowledge base locally or on a self-hosted server.

Work with notebooks, code files, consoles, and terminals in a browser-based interactive development environment.

A Synology note app for notebooks, clippings, voice memos, and synchronized offline editing.

A collaborative computing workspace where projects bring notebooks, files, terminals, and software into a shared environment.

Organize rich notes with nested notebooks, tags, and quick-access shortcuts.

A Windows note manager for clipped text, notebooks, hierarchical tags, and fast search.

A browser-only Jupyter distribution for running interactive notebooks from static web files.

An Android outliner for Org-mode notebooks, nested notes, tags, and manually synchronized files.

Collect team knowledge in searchable notebooks with links, tags, and collaborative editing.

Render technical Markdown and notebooks into reports, books, slides, and websites.

A browser-based Elixir notebook for executable code and Markdown, with interactive results and collaboration.

Handwritten study notes, PDF markup, audio capture, and AI-assisted review for students.

A browser-based Python notebook environment that runs on hosted compute and can load or share Jupyter notebooks.

A reactive Julia notebook that reruns dependent cells and keeps package-environment details with the notebook.

Research and backtest quantitative strategies in notebooks and code

A reactive Python notebook editor that saves notebooks as ordinary Python files.

A handwriting notebook with on-device encryption and optional sync to storage you choose.

Give groups of users access to managed Jupyter notebook environments from one hub server.

iPhone money notebooks organized by folders, people and tags

Break a project into nested tasks, then review it as a board or timeline.