StarUML

StarUML is free and open source software for modeling using the Unified Modeling Language (UML). It is a powerful tool that can be used to create various types of UML diagrams, including class diagrams, use case diagrams, component diagrams, deployment diagrams, state diagrams, and activity diagrams.

StarUML is written in Delphi, but is independent of any particular programming language, which means it can be used with any language that supports UML. StarUML is also highly extensible, which means it can be customized to meet specific user needs.

StarUML is an excellent choice for anyone who needs a UML modeling tool. It is a free, open source, and powerful tool that can be used with any language. StarUML is also highly extensible, which means it can be customized to meet specific user needs.