Enterprise Resource Planning
Just a few years ago, toward the end of the '90s, ERP epitomized Big, Serious Programming. It was entirely comparable to such more recent management fads as CRM, EAI, eBusiness, ... If anything, it has a less ambiguous ROI than these others.
Remarkably, given The widespread misperception that Tcl is a 'toy' language, and that the only applications in Tcl and Tcl/Tk aren't "serious" ones, there's at least one ERP package [L1 ] written in Tcl/Tk.