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J is a modern APL dialect with ASCII characters.

I prefer q/k ASCII APL dialect from kx systems[kx.com], it's not open source, but they released kdb+ free personal edition to play with.

kdb+ free personal edition to play with

which drops state and restarts every two hours.

then there is kdb+ terminal on https://code.kx.com But I admit - restarts are annoying.

I wonder, but am too lazy to check, if this can be circumvented by changing kernel jiffy definition. K has to get the time from somewhere.

Honestly I have no idea...