FreeDOS
Software
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FreeDOS is a free software operating system for IBM PC compatible computers. It intends to provide a complete MS-DOS-compatible environment for running legacy software and supporting embedded systems.
FreeDOS can be booted from a floppy disk or... Wikipedia
Initial release: 16 September 1994; 29 years ago
Programming languages: C and Assembly language
Available in: English, German, Dutch
Default user interface: Command-line interface (COMMAND.COM)
Developer: Jim Hall & The FreeDOS team
Latest preview: 1.3 RC5 / 14 December 2021; 2 years ago