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Redick is an open source implementation of the J Programming Language. The primary website for it is right here.
A proof of concept implementation of APL on the parrot VM. A work in progress. NB: This project hasn't been updated to work with a post 1.0 parrot.
q/kdb+ is a time-series database management product. It is minimal and oriented to high-performance, but provides a set of database operations much richer than SQL and a fully functional scripting language. It can be used for huge data-sets and real-time data processing. It is widely used in ... [More]
The first NARS (Nested Arrays Research System) was designed and implemented in the early 1980s as a testbed for new ideas in APL, principally with nested arrays. A quarter of a century later, it's time to try again. The goal of this effort, as with the last one, is to foster new ideas about ... [More]
J is a modern, high-level, general-purpose, high-performance programming language. J is portable and runs on Windows, Unix, Mac, and PocketPC handhelds, both as a GUI and in a console. True 64-bit J systems are available for XP64 or Linux64, on AMD64 or Intel EM64T platforms. J systems can be installed and distributed for free.
Kona is an open-source implementation of the K programming language (K3.2). If you're new to APL, you probably want this project. The K language was originally designed by Arthur Whitney and Kx Systems. It is an ASCII-based array language and a precursor to Kx's KDB, KDB+, and Q. Kona is unaffiliated with Kx.