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Large organizations you speak of that use COBOL are mostly insurance and finance megacorps, and some government, that were (and some still are) deep in the pockets of various mainframe vendors. Vendors distributed their own compilers with some tweaks to the language, like IBM.

It's extremely rare to see FOSS in such legacy systems. The push for FOSS in large corporations has been coming from the for newer stacks, designed by newer developers.

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I reckoned. But I was interested what compilers this one competes against.

DIGITAL, IBM and HP typically supplied COBOL compilers with their relevant big iron systems and a lot of time the actual code base will be tied so closely to a greater framework provided by/for those platforms that just being able to compile COBOL on an different environment is the least part of the migration process.

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