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J is a high-level, general-purpose programming language that is particularly suited to the mathematical, statistical, and logical analysis of data.

It is a powerful tool for developing algorithms and exploring problems that are not already well understood.

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J is written in portable C and is available for Windows, Linux, Mac, iOS, Android, Raspberry Pi and your browser with the J Playground.
J can be installed and distributed for free.
The source [1] is provided under both commercial and GPL 3 licenses. [2]