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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.
In general programming I like to use a keyboard layout which allows typing APL glyphs with Right Alt: https://github.com/abrudz/Kbd
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.