Squeak is described as 'modern, open source, full-featured implementation of the powerful Smalltalk programming language and environment' and is an app in the Development category. There are eight alternatives to Squeak for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android. The best alternative is F# (programming language), which is both free and Open Source. Other great apps like Squeak are React Studio (Freemium), Dolphin Smalltalk (Free, Open Source), Pharo (Free, Open Source) and Cuis (Free, Open Source).
React Studio lets you create components either visually or in code, then use them interchangeably in your designs. Customize your components with advanced property UIs and dynamic previews in the editing canvas.
Dolphin is a complete development IDE for Smalltalk targeted specifically at Microsoft Windows. It is capable of creating standalone GUI and console executables that will run on any version of Windows from XP up to the current Windows 10.
HaverOnCuis – for short Haver – provides an opensmalltalkvm based Smalltalk with modules. Haver’s module semantics are inspired by Python’s modules and, to a greater extent, by Scheme’s module semantics.