DexOS

DexOS is a 32-bit operating system written in x86 assembly. It is designed for coders that want direct access to all hardware (including CPU and graphics), with well-commented code and documentation. It's licensed under a free to use license for commercial and non-commercial use. It is written and maintained by Craig Bamford and other voluntary developers from around the world.
Modes.
DexOS has two modes for interaction: the graphical user interface GUI or the command line interface, both of which are available to user from boot.
Programs.
As of version 5.0, DexOS has: a FASM port, text editor, image viewer, full TCP/IP stack, many games, a web server and support for some sound and ethernet cards, and other programs.
Commands.
The following list of commands is supported by the DexOS Command Line.