J

A propretary collection-oriented programming language descendent of APL.

From its home page:

J is a modern, array oriented, high level, high performance, general purpose programming language. J is used in a variety of industries including banking, investment analysis, insurance, derivative trading, scientific research, and education.

Jsoftware home page.
Juggle home page, J for Unix.

This page is linked from: APL Glee Ken Iverson