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Re:Statement Regarding the Zen Programming Language by simias on Tuesday September 15, 2020 @10:54AM (#24481872)
They generally sell you an ecosystem though, and are often tied to specific hardware, not "just" a language.

The only examples that come to mind of a "pure" commercial compiler, not tied to a particular environment or piece of hardware are the Comeau C++ compiler (defunct for well over a decade) and arguably the original D compiler (although I don't know if it qualifies as proprietary, just not open source). Swift as well, although it was open sourced relatively quickly.

Re:Statement Regarding the Zen Programming Language by mhh__ on Tuesday September 15, 2020 @12:09PM (#24482927)
The D compiler is now completely open source. It was always source available, but Walter wrote the backend when he was at a different company and he was able to use it but because of copyright it couldn't be open sourced as per se.

Symantec signed off on it a few years ago, it's been Boost licensed ever since.