Basically its a custom Rom
A truly simple cooperative RTOS for bare-metal embedded applications
AquilaOS: UNIX-like Operating System
PRTOS is a simple, compact preemptive RTOS for embedded systems
Portable Figure Out system properties
Floor-level factory/shop automatization control software
An open kernel that you may edit however you want
Mulithreading Arduno library
DC/OS - The Datacenter Operating System
Writing an OS in Rust
Advanced Persistent Threat Security
The extensible bootloader for embedded system
A minimal Linux that runs as a coreboot or LinuxBoot ROM payload
Package manager for Chrome OS
Desktop for Linux Developed with Gambas3
An operating system written in D
The OS of the future.
OS X Alternative that installs on most new or old computers
Chromium OS Universal Chroot Environment (EOL)
An educational operating system written in C#
A Mac OS X look on the Raspberry Pi 2 with Kodi