Cuis is an Open Source, multiplatform Smalltalk-80 system. What sets Cuis apart from other Smalltalk systems is the focus on the original values of the Smalltalk project at Xerox PARC, and an active attitude towards system complexity: Just keep it to a minimum! There is more to be said about Cuis. Please see the Documentation.

The easiest way to download and run Cuis is to clone this Git repository. Alternatively, you can download the Zip file. Double click on it to unzip. Run the appropriate start script (RunCuisOnWindows.bat, RunCuisOnLinux.sh, RunCuisOnMac.sh). To start Cuis on a Mac from Finder, double click on RunCuisOnFinder.command. Note: On Mac, if you dowloaded the Zip File, you’ll likely need to open a Terminal on the Cuis folder, and run ./unquarantine.sh . This is needed for macOS to allow running an application extracted from a Zip file.