I'd really like to see a Red <-> Unity or Red <-> JS bridge. Unfortunately there's been no word on a JS bridge since it was suggested for Google's Summer of Code 2014. Android is an interesting but fast-moving target, I think Unity or JS would allow Red much more widespread adoption across platforms.

In the meantime I've been tempted to write a microservice in Red using the 0MQ binding [1]. Other bridges and bindings are listed on the contributions page [2].

[1]: http://rebol.esperconsultancy.nl/extensions/0MQ/

[2]: http://www.red-lang.org/p/contributions.html