Squeak - 3.10.2

Crashes after a few mouse clicks under Panther 7B79.

and thus Object Oriented Languages are more than just having classes and things called objects. Alan Kay and the people at Xerox PARC I think coined the term OOP, and in any case, he lists a number of properties a language has to have in order to qualify as OOPL. SmallTalk and possibly some of the LISP dialects and extensions are the first ones to qualify on all points. Thus neither C++ nor Simula are OOPLs, even though the latter constitutes a milestone on the way to OOPLs.

almost direct descendent of the original Smalltalk OS. Squeak's GUI is almost identical to the original, with a lot of additions, such as colour, so yes, this really is the original, or as close to it as you can get running usefully on a modern machine. Smalltalk was NOT the first object oriented language. That honour goes to Simula 67, developed in Sweden at the same University where Linnaeus first proposed the principles of classification. (Interesting twist). However, in 1967 user interfaces where mechanical (teletypes, punch cards etc.), so it's hardly surprising that OOP didn't catch on except amongst people modelling bird migration or weather systems etc. Arguably, the GUI was OOP's killer app, although Apple set us all back decades by ignoring the OOP features and developing MacOS in Pascal (duh!). Anyone know what's new with this version?

are the people who brought us the graphical user interface and fully object-oriented programming. In terms of popularization, Smalltalk is "the granddaddy of object-oriented programming languages" despite the fact that Simula was there first, and various Lisp dialects were there contemporaneously.

makes it a superb development tool. The same development will run bit-identical between most Squeak implementations. This provides transparent cross-development for me between Linux, MacOS, and OS X.