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APL's ASCII based relation, J is opensource(GPL, I think). [BQN](https://mlochbaum.github.io/BQN/) is a newer rationalized entry which is completely FOSS.

K is another array language which has a proprietary implementation. Tcl is a relatively popular proprietary language.

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Thanks for the info/links.

Wikipedia says Tcl is an open source language, did you mean a different Tcl?

https://en.wikipedia.org/wiki/Tcl

Tcl is open-source, distributed under a permissive MIT-style license.

IIRC, one key selling point of K was that it’s runtime fits inside an x86’s L3 cache.

It's a marketing point, yes. I think it actually has no practical benefit and wrote about why here: https://mlochbaum.github.io/BQN/implementation/kclaims.html#....

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