quantitative tools/frameworks implemented in the industry

Is there a standard set of pricing tools/frameworks/engines used at hedge funds to model securities? Or do firms pretty much write all of their own implementations of Black-Scholes/swaps pricing/binomal trees, etc? I'm not talking about commercial APIs like for Bloomberg or MD-Trader but I would assume those are used heavily anyway.

Is there any value (in terms of real world usage), in an open-source quant framework like QuantLib (http://quantlib.org/index.shtml)?

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