International Disk Operating System

International Disk Operating System or International DOS is a disk operating system released on February 8, 1985. Its main purpose is to make the Command Line Operating Systems foreign-friendly by making commands in the language the user specified.

User-packs
Since 1991, International DOS supports connectivity to the internet so they made a thing called User-packs which bring user changes to the operating system. Since 2006 its developers stopped pushing user-packs, with mainstream support ending. These are unofficially still available as user sustained-packs.

Graphical Extensions
For a long time several groups have made shells for International DOS with the main ones being: International Shell (GUI) and iTUI (TUI).