Try FreeNOS in a Virtual Machine with a Bootable ISO, or write the ISO to a CD/DVD, USB drive or SD card to try on real hardware.
Get the FreeNOS source code, make changes to anything in the OS and try it on your PC.
The latest FreeNOS code is publically available on our Github Git repository. To check out the lastest code read-only, point your Git client to:
user@host$ git clone https://github.com/nieklinnenbank/FreeNOS