Tcl is a Turing Complete, open-source, embeddable interpreted language. OpenACS additionally, uses these modules:
What others say about Tcl
- Tcl (tcl.tk)
- testimonials on tcl.tk
- Tcl the Misunderstood
- Tcl/Tk is perhaps the most mature of the dynamic languages, dating back to 1988. The evolution of the language over the last 20 years has been marked by passionate preservation of the balance between maintaining simplicity and utility with the adoption of new ideas and new techniques based on accumulated experience.
Tcl/Tk is used in a number of prominent software systems including DejaGnu (e.g. used for testing the gcc compiler), Expect and AOLserver. The language is used by many scientific organizations including NASA as well as being used extensively in the commercial and financial sectors. ( http://wiki.tcl.tk/20832 )