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There's only one Q.

Open source K is likely compatible with ngn/k or oK, both of which are based on k6. There are minor differences between these 2 implementations (one is browser-native, the other isn't) but for the most part code should work identically on both.

Q: https://code.kx.com/q/

ngn/k: https://codeberg.org/ngn/k

oK: https://github.com/JohnEarnest/ok/

I found the most recent episode of array cast[0] to be pretty illuminating regarding what’s what with k. I too found it pretty difficult to know which k is the right k to use.

0: https://www.arraycast.com/episodes/episode41-john-earnest

As far as I know, there's only one q, which is the query language of kdb+, implemented in k4.

This will be for kdb+. (Nick Parsis wrote a very good book on it, Stephen Taylor is the Librarian at KX)

try J