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

Coding exercises for data and machine-learning study

Filter and revise sections across many text files

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

Charles Darwin's publications, notebooks and papers

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

Desktop expense records with refund trackers and batch cleanup tools

Assemble portfolio backtests from reusable Python rules

Detailed spending tags, custom transaction rules and cash-flow forecasts

Inspect and transform JSON from a terminal with an interactive viewer and JavaScript queries.

Notebook-based symbolic and numerical computation

Organize self-hosted documentation in a hierarchy of books, chapters, and pages.

Build an internal wiki with rich pages, nested wikis, version rollback, and semantic search.

Combine project management, issue tracking, and team collaboration without per-user pricing.

Free desktop finance software with statement imports and reconciliation

Build Go command-line apps with subcommands, flags, generated help, and shell completion.

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

Add tags to notes and keep their related tasks and calendar context nearby.

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.