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Charles Darwin's publications, notebooks and papers

Use enterprise Kanban boards and Lean metrics to follow work from planning through delivery.

Reuse shared business metrics across dashboards and embedded analytics.

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

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

A Python IDE for creating, running, and debugging projects, notebooks, and data applications.

An open-source notebook for multimedia notes, attachments, and personal reference material.

Draw and animate immersive scenes with layered 3D strokes

Write or sketch by hand, then convert, search, and organize the result.

A handwriting notebook that links notes and searches handwriting, Markdown, and PDF text.