Tachiyomi[0] is a FOSS comic reader app for Android which has support for extensions to source comics from different sites which are unrelated to Tachiyomi

Tachiyomi already removed their extension list which contained both unofficial and official sources for comics[1]

[0] https://github.com/tachiyomiorg/tachiyomi

[1] https://tachiyomi.org/news/2024-01-09-extensions-removal