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Rebol2 is de-facto abandoned, Rebol3 has split into divergent community forks [1], and Red suffers from setbacks with organizational issues trying to deliver its vision. Carl is not involved in any of the projects.

In the Rebol family, "dialect" is an umbrella term for embedded DSLs and micro-formats [2]; nothing new compared to Lisp, Forth, and Logo, from which these ideas were borrowed.

[1]: https://stackoverflow.com/a/31517518/5889272

[2]: https://news.ycombinator.com/item?id=24083108