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http://phaseit.net/claird/comp.lang.functional/Erlang.html
Erlang/Tk is the standard GUI toolkit for Erlang developers.
Some things Erlang promotes that you can try in Tcl... Erlang Idioms for Tcl
See also Erlang/OTP, cop.
etclface - a Tcl extension that will allow software written in Tcl and Erlang to communicate using the Erlang/OTP interface, erl_interface.
Some of the aims of the Tcl extension are: