I know people still use COBOL, but does any important software use APL nowadays?
From Wikipedia:
> APL is used for many purposes including financial and insurance applications,[82] artificial intelligence,[83][84] neural networks[85] and robotics.[86] It has been argued that APL is a calculation tool and not a programming language;[87] its symbolic nature and array capabilities have made it popular with domain experts and data scientists[88] who do not have or require the skills of a computer programmer.[citation needed]
But the latest citation is from 2018, and some of these are just tutorials or articles.
From Wikipedia:
> APL is used for many purposes including financial and insurance applications,[82] artificial intelligence,[83][84] neural networks[85] and robotics.[86] It has been argued that APL is a calculation tool and not a programming language;[87] its symbolic nature and array capabilities have made it popular with domain experts and data scientists[88] who do not have or require the skills of a computer programmer.[citation needed]
But the latest citation is from 2018, and some of these are just tutorials or articles.