Squeak is an OpenSource and super-portable implementation of a multi-media capable Smalltalk-80 based object-oriented programming environment. It is written entirely in Smalltalk and has a high-performance VM, created by compiling the Smalltalk VM code into efficient and portable C code. It now uses the Self language's Morphic User Interface but still provides the original MVC GUI as well.
Visual Paradigm for UML is a Unified Modeling Language (UML) design tool that supports all UML diagrams, SysML diagrams, and entity relationship diagrams. Visual Paradigm for UML provides extensive use case modeling features, including full function UML use case diagram, flow of events editor, use case/actor grid, and activity diagram generation. Visual Paradigm for UML produces system documentation in PDF, HTML, and MS Word formats. A developer can design system documentation with the template designer. A system analyst can estimate the consequences of changes with impact analysis diagrams, such as matrix and analysis diagram. Visual Paradigm for UML generates Java code.
Logic's Gate is a simple logic computer aided design tool. It is useful for creating and testing logic circuit designs. It is also especially useful for students who wish to see the individual states of the logic gates in a complex logic circuit, given specific inputs. It is written in Smalltalk and runs in Squeak 3.7 and greater. It requires Connectors 2 to be installed in the image in which it runs. Connectors 2 is available on Squeak Map from within Squeak.