The greatest innovation of Tcl was how easy it was to extend with libs in C. I still thinks that Tcl's author famous paper about using "glue languages" is still

The greatest innovation of Tcl was how easy it was to extend with libs in C. I still thinks that Tcl's author famous paper about using "glue languages" is still one of the best ideas in software engineering. Read about it in Ousterhout's Dichotomy: http://wiki.tcl.tk/9865 http://wiki.tcl.tk/9865