Dia
Open Source
Dia is free and open source drawing software.
StarUML
Commercial
StarUML is an opensource UML tool.
UMLet
Open Source
UMLet is an open-source Java-based UML tool designed for teaching the Unified Modeling Language and for quickly creating UML diagrams.
Astah Community is a free software design tool which supports the latest UML diagrams.
PlantUML
Open Source
PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.
Umbrello
Open Source
Umbrello UML Modeller is a free software UML diagram tool available natively for Unix-like platforms and Windows.
Visual Paradigm
Commercial
Visual Paradigm (VP-UML) is a UML CASE Tool.
Modelio
Open Source
Modelio is an Open Source UML tool.
Compare ArgoUML with alternatives
Compare Visual Paradigm and ArgoUML and decide which is most suitable for you.
Compare astah Community Edition and ArgoUML and decide which is most suitable for you.