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"The BRL-CAD source code repository is the oldest known public version-controlled codebase in the world that's still under active development, dating back to 1983-12-16 00:10:31 UTC." -- https://en.wikipedia.org/wiki/BRL-CAD

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Also a poster child of Tcl power: https://wiki.tcl-lang.org/page/BRL-CAD

Tcl's integrated for the long haul, but clock is ticking on Tk. Migration will take a while, but Qt GUI is in the works.

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