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I think most people who were interested in Rebol have moved over to Red.

It's very similar to Rebol and is under active development. If you like Rebol and haven't tried Red, it's worth taking a look:

Try Red whether you have tried Rebol! It's very cool, I first saw it here on HN when someone showed https://www.red-lang.org/2016/07/native-reactive-spreadsheet...

which is a spreadsheet in 17 lines of code using the inbuilt reactive system.

There is still a small community working on the open-sourced Rebol 3:

In fact there was a Rebol conference only last month - http://2019.reb4.me/

Does it have a garbage collector yet?

Yes.

Curecode (https://www.curecode.org/rebol3/) is no longer used. Everything was moved to Github a few years ago - https://github.com/rebol/rebol-issues/issues

I was amazed at how quick I could develop applications for the web with it. In my over 30 years of software development, nothing comes close.