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Plan prepaid travel data with a separate calling-number benefit

Linux GPU recording with an instant-replay workflow

Bitcoin app and hardware with a two-of-three recovery design

Capture your screen as a video, screenshot, or AI guide and share it with a link.

Open source screen recorder for Mac, Windows, and Linux

VidStats is a YouTube analytics platform with real-time tracking, competitor analysis, and creator tools.

Formula calculators with selectable input units

Practical finance, cooking and unit calculations

Construction and everyday calculations with searchable tasks

A catalogue of practical and specialist calculations

Scientific and everyday calculations with units

High-precision scientific calculation with reusable expressions

A desktop calculator with recall and configurable precision

Scientific calculation with RPN and programmable functions

Statistical calculators linked to formulas and references

Browser tools for beam and structural calculations

Circuit and electrical formulas grouped by task

Emissions estimates for travel, homes and events

Editable notes with live scientific calculations

Notes, variables and arithmetic in a browser

Weather quantities with linked formulas

Plot equations and coordinate data in two or three dimensions

Aptitude-test preparation with free full-length practice, worked solutions and employer or publisher browsing.

Build interactive terminal applications in Go with an event-driven model, update, and view loop.