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Re:Little: a tcl-based c-like scripting language by luckydude on Friday April 22, 2016 @11:34AM (#11549932)
http://www.tcl.tk/about/language.html

is decent place to start. Then move on to

http://www.tcl.tk/software/

and there are all the Tk (GUI) APIs and libraries.

If you wade through that, or you get stuck, #tcl on freenode is a great resource.

Edit: #tcl told me to pass on this:

https://core.tcl.tk/jenglish/gutter/index.html

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