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I would also like to know if there's examples of more real time applications in APL. Any GUI programming? Interactive simulations? etc.

Tangentstorm’s videos about J have some nice GUI examples. For example https://youtu.be/uL-70fMTVnw

Pretty cool thanks, this one covers interactivity https://invidio.us/watch?v=CzK2SazvCxM (it's a little sprite editor)

Do you know if GNU APL offers the facilities to do stuff like that?