There are 2 repositories under font-manager topic.
A font manager for iOS to apply custom font to whole app, support multi font and change font at runtime
FontMassive Pack - Набор программ для работы со шрифтами.
A very easy-to-use, portable and friendly font loader
🌳️🌐️🔠️ The Bliss Browser font collection source repository, enabling font customization, control, and rendering within the browser.
A lightweight and flexible React library that allows you to dynamically change fonts in your React applications.
A font manager for Android to apply custom font to whole app, support multi font and change font at runtime