&gt;This guy wrote everything you could possibly think of in TCL.
&gt;That company is powering a ton of enterprise grade e-commerce web sites.<p>During the dot-com boom (late 1990s through early 2000s) there was this company called Vignette which was using Tcl on the server for e-commerce, IIRC. They had a product in Tcl, which could be customized for various e-commerce apps, I think. Probably the USP was RAD, Tcl being a scripting language.<p>Also I read about AOL using AOLServer which was written in Tcl.