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J is a high-level, general purpose programming language. The J system provides: an engine for executing J; various front ends that provide user interfaces to the J engine; a library, written in J, that provides an IDE (interactive development environment), numerous tools, utililties, demos, tutorials; and online documention.

J Systems are available for Windows, Windows 64, Windows PocketPC, Macintosh Intel, Macintosh PowerPC, Linux, Linux 64, and others. The core language is identical in all versions, and programs not making use of platform-dependent features will work unchanged on all systems.

J is documented in several online html books that are distributed with the system.

J is licensed for free installation on all platforms. You can download, redistribute, and run end user applications built with J for free.

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