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I think he also wrote an implementation of a tcl-like language called Jim.

No, that was by Steve Bennett.

Sorry no, antirez (Salvatore Sanfilippo) was the original author, Steve Bennett took over maintenance later - https://jim.tcl.tk/index.html/doc/www/www/about/ .

My bad; I'd forgotten about Salvatore's role. Steve Bennett is the one I saw present about it at the Tcl Conference some years back.