Squeak

Based on Smalltalk which was created more than 35 years ago. Smalltalk defined the term object orientation and is the first language in which everything is built from objects. Smalltalk is deeply inspired by ideas from Simula, Sketchpad and Lisp.

Even today, Smalltalk sets the bar for object oriented dynamically strongly typed interactive languages and environments. Unlike the standard static, file-based approach of other languages such as Ruby or Python, Squeak offers a true uniform fully reflective environment - real live objects. In this environment, when a change is made to an object, its behavior changes immediately without having to restart the system. You can even modify or create objects while the application is running.

Squeak includes class libraries and virtual machine plugins for advanced multimedia including anti-aliased 2D, accelerated 3D, real-time sound and music synthesis, MPEG2 video and much more. In addition, Squeak has one of the most advanced fully reflective development environments ever created with over 600 addon packages available for single click download and installation.