"Dylan is a new programming language invented by Apple Computer and developed with Harlequin and other partners.
The language is both object-oriented, like C++ and Java, and dynamic, like Smalltalk.
Dylan is designed to deliver applications that run efficiently on a wide range of platforms.
It also facilitates the rapid development and incremental refinement of prototype programs.
Dylan is a good choice for any application, but you will find it particularly useful for complex object-oriented programs, and for programs that may need to be changed "on the fly."
Public-domain implementations of Dylan are available for most popular computer systems.
Harlequin has developed the first complete, commercial implementation of the language--including both compiler and development environment." (Neal Feinberg et al.)