Pharo is described as 'Pure object-oriented programming language and a powerful environment, focused on simplicity and immediate feedback (think IDE and OS rolled into one)' and is a programming language in the development category. There are more than 10 alternatives to Pharo for a variety of platforms, including Mac, Windows, Linux, BSD and Web-based apps. The best Pharo alternative is Python, which is both free and Open Source. Other great apps like Pharo are F# (programming language), Mojo, React Studio and MicroPython.
SqueakJS executes Squeak in a web page without a plugin. It is a fully capable virtual machine implemented in pure JavaScript running unmodified Squeak images. Squeak is a modern implementation of Smalltalk, the original dynamic object-oriented programming environment.
