Dreamshell

DreamShell is a Unix-like operating system, designed for the Sega Dreamcast video game console. It is based on KallistiOS libraries. Originally a command line interface with the ability to run third-party applications, later versions of DreamShell gained a GUI XML-module and support for applications written in the lua-scripts, with the ability to enhance their functionality by using functions of KLF-modules (analogous to DLL in Kallisti OS).
DreamShell 4.
Fixed modules mp3 and ogg, now when they are loaded into the console commands appear to play these formats, as well as their support is implemented in the file manager.
Some internal to external commands were added, so as to facilitate the DS kernel.
Applications.
File Manager.
The first application, which appeared in DreamShell version 4.0.
DSInstall.
Allows you to install the operating system directly to Dreamcast BIOS.
Region Changer.
Lets you change the console's regional setting and video output format (PAL / NTSC) without flashing the BIOS. The application relies on consoles with a modified motherboard.