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An Android calculator with scientific mode and history

A health publication with topic collections and practical question-led explainers

Science questions, discoveries and everyday explanations

Creative attention and ideas from Rob Walker

Calculate returns, portfolio statistics and allocation weights in Python

Keep confirmed dividend dates and income forecasts in view

Sales-tax calculations and filings with a team to manage the work

Keep trade plans, checklists and later review in one journal

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

A Windows-based employee time clock with job tracking, overtime, PTO, and payroll-ready reports.

Connect a lease portfolio with accounting journals and disclosure reports

Crypto tax reports with transaction checks and optional expert help

US sales tax reporting, calculation and optional automated return filing

See how an asset allocation behaved across different starting years

Indirect tax calculation and compliance connected to business systems

Put checkout buttons and digital delivery on an existing website

Split group expenses and settle shared balances without creating accounts

Compare company fundamentals visually with historical stock valuations

Turn connected sales into tax invoices, threshold alerts and filing reports

Bank activity for personal cash-flow dashboards in spreadsheets

Forms with response editing, routing, and collaborative results

Organizational ballots with voting weights, proxies and scheduled notices

Custom Google Forms with calculated answers and website styling.

Create process-control charts and statistical analyses inside a compatible Excel installation.