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Tcl is a supported platform of FlightAware's XML API[3]
A success story from AMD's website reveals: The company, which successfully migrated to AMD64 in less than two weeks, is running FreeBSD, PostgreSQL and TCL (Tool Command Language), a popular development language for real-time applications, on 2P AMD Opteron™ Model 250 processors. [4]Wow, Tcl is a popular development language for real-time applications. ;-)
stevel - 2011-02-25 19:46:39A 37Signals article on FlightAware is at [5]A transcript of the problems encountered (and how Tcl allowed them to deal with it) during Boeing's recent 787 "sky-writing" test flight appears on their blog
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dkf - 2016-11-23 22:48:58They've sponsored a Tcl bounty programme; though originally mentioned a couple of years ago, the rules are now set.