Metamine - it seems to have been pulled from the internet by its creator, after having given some really cool demos.

What's weird: it allows a mix of declarative and imperative syntax in a style that seems like normal procedural programming. You have a "magical equals" that is actually reactive programming... if any of the terms change, ever, the result gets updated.

Here's a previous thread about it

https://news.ycombinator.com/item?id=27555940