Enough praise hasn't been given to Tcl regarding its TCP networking capabilities. While [UDP] support is lacking in the core, you are given access to a powerful, event driven I/O facility by means of [socket], [fileevent], [fconfigure], [gets], [read] et al.
The capabilities assumed by [Network server application template] (and other, better templates) are unmatched by other scripting languages.
(Ah, the wonderful compression of  ''fconfigure $chan -blocking 0 -buffering line; fileevent $chan readable [list handle_input $chan]'')

Heck, Tcl's whole I/O subsystem (realized through channels and events) is light years beyond the competition.

-- [Todd Coram]  ''heaping praise where praise is due''