According to Wikipedia, Mathematica was initially released in 1988. Rebol was first released in 1997.

Maybe Rebol inspired some part of Mathematica that came later, like the manipulate/dynamic system?

Rebol also influenced JSON, according to some people, per links in this post (on my blog):

https://jugad2.blogspot.in/2012/12/rebol-language-that-influ...