HorizonOS is an experimental operating system archive developed from the ground up for the x86 (i386) architecture.
Important
ALL development on this project has stopped as of February 9, 2026 and will be continuing at this organization (click me!). All projects here are considered archived and dedicated to the public domain.
HorizonOS is a ground-up OS project that explores:
- Kernel development for x86 architecture
- Custom toolchain and build systems tailored for OS development
- Systems programming fundamentals without the abstractions
- Educational exploration of operating system internals
This organization hosts:
- The OS itself - Core kernel, drivers, and system components
- Custom tooling - Specialized tools built specifically for Horizon development
- OS-Specific Applications - Additional utilies built for Horizon
- Build infrastructure - Everything needed to compile and test the OS
- Documentation - Guides, specs, and notes from the trenches
HorizonOS is now archived. Thank you for being a part of the journey.
"The best way to learn how operating systems work is to build one. One compiler error at a time."