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

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

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

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

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

Capture notes and find them later with tags and Smart Folders.

A cross-platform hierarchical note manager with rich text, attachments, tasks, and reminders.

Daily and project notes connected to tasks, Apple Calendar, and Reminders.

Write and annotate handwritten notes on Android with page layouts, linked notes, and PDF tools.

Collect Markdown notes in folders and tags, then search or browse them in a feed.

An AI notebook that checks facts, links related ideas, and helps keep notes current.

An outliner that turns notes into searchable, reusable knowledge with tags and saved views.

Organize notes, lists, projects, and ideas in tagged bundles with offline editing and sync.

A multi-format notebook for handwriting, PDFs, voice notes, and study documents.

Capture daily notes in local Markdown files and connect ideas with backlinks.

A fast local-first notes app with Markdown, offline writing, semantic search, and optional sync.

A zoomable handwriting and planning notebook with sub-pages and document annotation.

A browser-installable notes app that stores Markdown files in the user’s Google Drive or Dropbox.

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

Keep notes, scribbles, images, videos, and web clips together on a visual canvas for Mac.

A tagged visual-reference library built around local folders

A local-first Markdown notebook with daily notes, history, and optional private sync.

A local Markdown notebook that turns notes into links, tasks, and searchable topics.

A desktop workspace for linked Markdown notes, PDFs, and research in local workspaces.