The ultimate DOS XMS memory manager
cMIPS - an FPGA ready VHDL model for 5-stage pipeline, MIPS32r2 core
Crosos is a SubLinux Distribution
Supporting 4op instruments, two effect columns and instrument macros.
Gameboy Advance emulator for Android phones
Mayax is a 32-bit hobby OS with windows style GUI.
A Practical Lock-Free General Purpose Operating System
NES emulator for Android phones
Gameboy and Gameboy Color emulator for Android phones
z390 Portable Mainframe Assembler and Emulator
Tarbox OS is a minimalistic 16 bit OS being developed in x86 Assembly.