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Arrange notes in notebooks, sections, and pages for classes, projects, or reference material.

A free Android Markdown notebook for notes, task lists, reminders, and attachments.

Collect notes, web research, tasks, and reference material in a searchable workspace.

A Windows personal information manager for capturing and retrieving notes, files, links, and web snippets.

Arrange notes and long-form writing in nested books that can grow into projects.

A desktop note environment for Markdown, source files, mind maps, PDFs, and other formats.

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

Explore Python interactively with completion, object introspection and persistent command history.

An iPhone and iPad notebook for handwriting, PDF markup, audio notes, and searchable study material.

Compare allocations using volatility, downside losses and drawdown risk

AI-native business intelligence for ad hoc analysis, dashboards, and data workflows.

Coding exercises for data and machine-learning study

Record ideas by voice, then send usable notes to your existing apps

Run analytical SQL in an embedded database from a local process or Python program.

Calculate returns, portfolio statistics and allocation weights in Python

Write with a stylus in flexible notebooks that can also hold and annotate PDFs.

Inspect the product, model and market inputs behind a valuation

Experiment with financial language models, sentiment and forecasts

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.

Keep reading notes, quotations, analysis, and source details beside the writing they inform.

An open-source iPad notebook for Apple Pencil writing and PDF markup.

A connected-notes app with a knowledge graph, visual maps, transcription, and an optional AI agent.

Local Markdown notebooks with backlinks, search, and optional self-hosted encrypted sync.