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A handheld-style scientific calculator for Android

Linked mathematical views for algebra, geometry and graphs

Cloud-service cost estimates with inspectable assumptions

Azure cost scenarios from selected services and usage

Browse a categorized directory of free mockup resources.

Load project-specific environment variables when entering a directory, then unload them when leaving.

Free voice calculator you speak to, in the browser or on iPhone.

Formulas and notes arranged on a mathematical worksheet

Monthly cost scenarios for planned cloud workloads

Topic-based calculators for practical questions

Mathematics and practical calculators by subject

Arithmetic, finance and programming modes in one app

Integration with visible input, steps and graphs

Air-travel carbon estimates with a published methodology

A maintained HP-42S calculator simulator

Visual calculator forms with custom price rules

Graph equations, inspect points and evaluate functions

Equations explored through graphs and symbolic methods

Practical finance, cooking and unit calculations

Garden supplies with calculators and plant-support collections

AI prompt hub, model directory and visual prompt builder

Independent AI tools directory with free prompt and model resources.

An Android calculator with scientific mode and history

WordPress forms for estimates, payments, and front-end submissions