ARM is a design not an implementation.

C and C++ are ISO standards, with multiple implementations.

JavaScript is an ECMA/ISO standard, with multiple implementations.

Rust is sponsored by an international foundation.

Additionally, Harmony OS is its own thing, it has long stop being an Android fork, with ArkTS and Cangjie, as the main way to develop applications for the platform.

https://developer.huawei.com/consumer/en/arkts

https://cangjie-lang.cn/en