Neptune is a kernel and operating system for x86 PCs.
Embedded Operating System
A advanced graphical operating system.
Embedded Real-Time Operating System (RTOS)
An open source OS written in assembly.
A new OS
a secure, open source OS for use inside USEagency facilities
Crosos is a SubLinux Distribution
Project has been move to https://github.com/ciaa/Firmware
Hard Real-Time OS compliant to the Osek/Vdx standard.
operating system for Intel 8086 / 8088
Nanux Kernel
Danja Operating System
Mayax is a 32-bit hobby OS with windows style GUI.
Operating System in 512bytes.
Tarbox OS is a minimalistic 16 bit OS being developed in x86 Assembly.
an os for x86 computers based on mikeos