Cuis

"Cuis is a free Smalltalk-80 environment originally derived from Squeak with a specific set of goals: being simple and powerful. It is also portable to any platform, fast and efficient. This means it is a great tool for running on any hardware, ranging from RasPis and the like and phones, up to cloud servers, and everything in between, including regular laptops and PCs.
Cuis is

• Small
• Clean
• Appropriable

Like Squeak, Cuis is also:

• Open Source
• Self contained
• Multiplatform

Like other Smalltalk-80 environments (including Squeak, Pharo and others), Cuis is also:

• A complete development environment written in itself
• A pure, dynamic Object Oriented language

Cuis shares the OpenSmalltalk Virtual Machine with Squeak, Pharo and Newspeak. What sets Cuis apart from the rest of the Squeak family is the focus on Smalltalk-80 and an active attitude towards system complexity.

We follow a set of ideas that started with Jean Piaget's Constructivism, and later explored in Seymour Papert's Mathland. These lead to Alan Kay's Learning Research Group's Personal Computer for Children of All Ages, Personal Dynamic Media, i.e. the Dynabook and then to Smalltalk-80. To us, a Smalltalk system is a Dynabook. A place to experiment and learn, and a medium to express the knlowledge we acquire. We understand software development as the activity of learning and documenting knowledge, for us and others to use, and also to be run on a computer. The fact that the computer run is useful, is a consequence of the knowldege being sound and relevant. (Just making it run is not the important part!)

Cuis Smalltalk is our attempt at this. Furthermore, we believe we are doing something else that no other Smalltalk, commercial or open source, does. We attempt to give the true Smalltalk-80 experience, and keep Smalltalk-80 not as legacy software to be run in an emulator, but as a live, evolving system. We feel we are the real keepers of Smalltalk-80, and enablers of the Dynabook experience.
Cuis is continuously evolving towards simplicity. Each release is better (i.e. simpler) than the previous one. At the same time, features are enhanced, and any reported bugs fixed. We also adopt recent enhancements from Squeak."

https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev

http://cuis-smalltalk.org/