Hyperglot
Is a toolkit for discovering language support in digital fonts.

Hyperglot systematizes the basic characters needed to write in the world’s languages. The Database view lets you browse through all of the languages and their orthographies in the world’s scripts. The Font checker detects which languages a font might support. You can also review any additional design requirements. The Hyperglot database currently includes orthographies for over 783 languages.

https://hyperglot.rosettatype.com/