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J is a high-level, general-purpose programming language designed for mathematical, statistical, and logical data analysis, suitable for algorithm development and exploratory programming, with a portable C implementation across Windows, Linux, Mac, iOS, Android, and Raspberry Pi. Jd is a high-performance, columnar RDBMS written in J for storing and analyzing large datasets, free for non-commercial use, with data mapped to J nouns for direct use of J primitives. The project provides tutorials, documentation, and a community ecosystem (forums, wiki, Stack Overflow) and has current releases like J9.6 with a J9.7 beta available.
AI named JSoftware in January 2026.