Dyalog APL
Dyalog APL is an implementation of APL.
Other implementations of APL.
Dyalog is a modern, multi-paradigm programming environment that combines the array-oriented APL notation with functional, procedural and object-oriented programming.
This cross-platform APL interpreter is available for Mac OS, Microsoft Windows, Linux, AIX and the Raspberry Pi.
It can be tried in a browser (with some limitation) at Try APL.