Pointwise [1] is a Texan company specialized in grid generation and pre-processing for CFD (Computational Fluids Dynamics). Its major product (Gridgen) embeds a Tcl-Tk based scripting language called GridgenGlyph [2]. It provides customization capabilities covering the entire range of functionality available in Gridgen for commands and GUIs. - Script samples are available here [3]- See also this article Automating Mesh Generation Through Scripting (pdf)- See Wenny Wang's articles at the Annual Tcl Conference 2009 [4] [5]