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Air-travel carbon estimates with a published methodology

Notes, variables and arithmetic in a browser

Symbolic expressions with documented algorithms

Matrix-based numerical calculation and visualization

Symbolic calculation through a compact command interface

Fluid-flow calculators for pipes, valves and measurements

Weather quantities with linked formulas

RF coil, antenna and related engineering calculations

Practical telescope and observing calculations

Formula-driven apps built from spreadsheet-style logic

A setlist planner and personal songbook

Telescope and camera calculations for observing setups

Airfoil comparison, plotting and geometry calculations

Geometry and structural formulas with dedicated inputs

Calculators with worked steps for selected problems

German bookkeeping with project time and a digital document archive

Physical calculations with tracked units and exact quantities

Engineering formulas organized by discipline and quantity

An Android calculator with scientific mode and history