[FW]: If you like Tcl for its high-level programming style, simplicity and cross-platform compatibility, you may also want to check out http://www.rebol.com/%|%REBOL%|%, or its much younger descendent, http://www.red-lang.org/%|%Red%|%.

REBOL is the "Relative Expression-Based Object Language", created in 1997 by Carl Sassenrath, also known for AmigaOS.  It has been described as a "dialect-oriented", having a very similar syntax to Tcl and (in Carl's words) "its greatest strength is the ability to easily create domain-specific languages or dialects".  http://c2.com/cgi/wiki?RebolLanguage%|%Ward's wiki has some examples%|%.

Rebol was open-sourced in 2012, leading to some resurgence in its popularity.  The https://github.com/metaeducation/ren-c%|%ren-c project%|% is aggressively overhauling the implementation to push open-source development on REBOL and Red further.

Historically, REBOL was very much a scripting language rather than for "serious application development" (no threads, rasks or event loop), though as of 2015 a lot of ground has been gained.  Tcl'ers may have qualms about the many, many first class types in REBOL (email addresses have a type!), but will find much its the "dialect-oriented" nature and clean syntax comfortingly familiar.

   * http://www.onlamp.com/pub/a/onlamp/2003/10/30/rebol.html%|%an ONLAMP article from 2003 about REBOL and its VID graphical extension.%|%
   * http://www.drdobbs.com/embedded-systems/the-rebol-scripting-language/184404172%|%Dr Dobbs in 2000%|% and a https://news.ycombinator.com/item?id=9946300%|%related HN discussion from 2015%|%

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http://www.rebol.com/
 What: REBOL to Tcl interface
 Where: From the contact
 Description: Contact posted a small example to comp.lang.tcl,
        demonstrating how simple it was to set up a client server
        between REBOL and Tcl/Tk interpreters so that
        REBOL could do graphics in that fashion.
        Intended only as a proof-of-concept demonstration.
 Updated: 07/1999
 Contact: mailto:icimjs@loop.com
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[RS] likes the very minimal assignment syntax in REBOL:
 var: value
which a [radical language modification] gives you in Tcl too...
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Another [Scripting Language].  


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