Compose--
Minimalistic declarative UI engine in Kotlin built on top of flow. Loosely based on fudgets.
Idea
Compose-- ("Compose minus minus") is built a simple and elegant idea, with it's roots in the fudgets library in Haskell -- arguably the earliest example of a functonal (as opposed to object-oriented or procedural) GUI framework. That idea is that user interfaces are just stream processors that can be composed in different ways. As such, conceputally in Kotlin they can be thought of as the type Flow<A> -> Flow<B>. Doesen't get much simpler than that!
In reality, the type in Compose-- is slightly more involved, as in addition to the conceputal API of a UI viewed as Flow<A> -> Flow<B>, we also need to be able to specify how the view elements are laid out. Compose-- handles this with the View.Builder interface, which defines an API for combining multiple views into a single view.