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GNU APL is a perfectly reasonable APL implementation. There are open source implementations of some K versions - Kona, which is K3, and oK, which is ~K5. J is

by icen 8y ago

GNU APL is a perfectly reasonable APL implementation. There are open source implementations of some K versions - Kona, which is K3, and oK, which is ~K5. J is available under GPL3.