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Dev tools · August 25, 2016

KA

KnightOS – An open-source OS for calculators

KnightOS – An open-source OS for calculators launched on August 25, 2016 with 180 votes, #158 of 3,856 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 10 years on.

Visit knightos.org ↗Alternativestop 4% of August 2016

In plain words

KnightOS is an open-source operating system designed for calculators. The project provides an SDK for building packages, though it experienced a period when package hosting was unavailable. Recently, alternative hosting was set up and the SDK was updated to support it, restoring core functionality. KnightOS is intended for developers interested in calculator software development and customization.

written from the facts on this page · September 2026

From the sources

The KnightOS SDK has been unable to build packages for years, as the prior host of packages.knightos.org has been offline, and no replacement was forthcoming. Recently, Max Leiter set up an alternative host with some core packages, and patched the SDK to support using it. KnightOS holds a special place in my heart, and it probably always will. It’s lodged right next to some of the tubes, and the doctors say there’s no way I would survive attempting to remove it. It’s a tragedy really, but I make the most of it. Your pointy swords won’t ensnare me forever, KnightOS! Eventually I’ll be dead! Ha! As a calculator programming hobbyist and open source enthusiast, I have been watching KnightOS’s…from knightos.org

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