I'll give you defacto standard, but all of the vendors have their own flavor (Synposys, I'm looking at you). Cadence still actively develops their Skill language (Virtuoso). I just saw some VPX last week too. I see it as a very old language that hasn't evolved like almost every other decent language.
> I see it as a very old language that hasn't evolved
Part of the point of the referenced article is to dispel such notions. In fact, it has evolved aggressively and continues to do so; e.g.: coroutines, effective threading, Unicode, virtual filesystems, programmable channels, etc. -- many of whose features are unmatchable in other languages.
It lacks some advanced features, but so does bash- to me, Tcl makes the most sense when you think of it as a shell.