Squeak

Squeak is an open‑source implementation of the Smalltalk language and integrated development environment that runs on macOS, Windows, and Linux (including ARM). It provides a fast execution engine and a graphical framework called Morphic, which enables developers to build and modify interactive applications with minimal effort. The system includes tools for browsing, searching, and editing Smalltalk code, as well as runtime debugging that supports concurrent sessions and direct code updates.

The environment supports automatic change tracking and distributed version control through Monticello, allowing multiple users to collaborate on projects. A variety of UI themes and personalization options are available, and the language’s expressive syntax is complemented by direct manipulation capabilities that facilitate creative and educational programming.

Squeak is used in domains such as education, multimedia, gaming, research, and commerce. A active community maintains mailing lists, a wiki, and a weekly blog, while an oversight board coordinates development and bug‑fix processes, ensuring the platform remains stable and extensible.