uDOS is a free operating system built on the FreeDOS kernel with DJGPP. uDOS provides an integrated suite of features inluding Perl, Python, etc., as well as a Watt-32 based networking environment and ELF library support. Can be run live from CD image.
Crosos is a SubLinux Distribution
Crosos is a open-source OS. It is based on the Linux Kernel and mostly uses the same code in Ubuntu (but it has been derived from Debian)
The future of information technology will be based on controlling the flow of natural light. This project is an attempt to establish the code (or software) that will enable this to happen. It involves rewriting an OS from the ground up.
A collection of dozens of entertaining educational programs. Optionally bootable from Floppy, CD, or USB. Only the open source portions of FUZOMA are hosted on Sourceforge. Visit the Project Homepage for the full version of FUZOMA.
A x86 hobbyist operating system written in C and assembly.