It looks like Tame is a pre-processo that outputs C++, hardly a C++ language feature. I mean, more power to you if you like to use those, but that is hardly C++.

The Scala question seems to have too many caveats, you should read the comments as there is no full translation of the F# async translation in the stackoverflow question. The answer with the most question states "with some important features lost". The comments on the question and answers should be read as well.

Cute Http Stack though.

The lamina code runs the code on a separate thread (https://github.com/ztellman/lamina/wiki/Introduction) hardly what C#'s async does. Not that I care that much, but that is what the docs say.

You forgot to show us how Node.js is supposed to support async-like programming without callbacks. I suspect in a rush to enumerate a bunch of languages, you merely listed everything you could think of and hoped some of it would stick?