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A hosted notebook editor for Python and data work, with SQL cells, collaboration, and interactive reports.

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.

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

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

Coding exercises for data and machine-learning study

Charles Darwin's publications, notebooks and papers

Notebook-based symbolic and numerical computation

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.

Compare strategy experiments across assets, parameters and historical periods

Build reusable implicit models and prepare geometry for engineering tools