Antido

Antido is not a natural human language spoken natively in any country or territory, but rather an artificial auxiliary language created as a reform of the constructed language Ido (itself an offshoot of Esperanto)
Antido was developed as a schematic project designed to overcome perceived shortcomings and grammatical complexities in earlier constructed languages like Esperanto and Ido. Because it is an experimental project meant for international communication rather than the indigenous tongue of a real-world community, it has no native geographic region, countries, or territories where it is naturally spoken.