SIMD macro assembler unified for ARM, MIPS, PPC and x86
RTOS for Secure, Safe and Real-Time Systems
Real-Time Embedded Operating System
Helps you to Boot your Experimental Assembly Language programs
An operating system for tenputer
64-BIt Operating System with Compiler
High Speed Karlsruhe open automotive code initiative
An open source OS written in assembly.
Fixed point 16/32 integer FFT library for the Raspberry Pi and Android
operating system for Intel 8086 / 8088
Small 32-bits operating system
Mayax is a 32-bit hobby OS with windows style GUI.
Tarbox OS is a minimalistic 16 bit OS being developed in x86 Assembly.