AplsAndRelatedLanguages

[http://aplusdev.org/ A+] is fast interpreter supporting a subset of APL (no complex numbers) with POSIX extensions.

[http://www.nial.com Nial] is a melding of APL and Lisp.

[http://numpy.scipy.org NumPy] is an APL inspired extension to the [http://python.org Python] programming language.