An indie, hobby operating system
Small real time operating system for AVR and ARM microcontrollers
Neptune is a kernel and operating system for x86 PCs.
An open source OS written in assembly.
Embedded Real-Time Operating System (RTOS)
A new OS
Hard Real-Time OS compliant to the Osek/Vdx standard.
Mayax is a 32-bit hobby OS with windows style GUI.
Operating System in 512bytes.
A True Web Operating System
An operating system based upon the MOSA kernel.
A simple os written in ASM
Simple AVR OS