A modern programming language that makes developers happier.

kotlinlang

Will there be an open-source platform similar to pub.dev? I think the biggest issue is the open-source ecosystem.

Kotlin Multiplatform libraries can be published on Maven repositories.
So, for now it is the best choice to propagate dependencies.

In the future, it is a good idea to create a gallery with an overview of Compose Multiplatform compatible libraries.

By the way, there is a good set of libraries for Kotlin Multiplatform Mobile:
<https://github.com/terrakok/kmm-awesome>