ArgoUML vs Violet UML Editor

ArgoUML is a free, open-source UML modeling tool for creating standard UML 1.4 diagrams. It supports all nine diagram types in that standard and follows the OMG UML 1.4 specification. The application is written entirely in Java and is intended to run on platforms with Java 5 or Java 6; the project offers installation through Java Web Start. Models use a JMI-based repository and XMI for saving: ArgoUML imports XMI 1.1 and 1.2 and writes XMI 1.2. Diagram output can be saved as GIF, PNG, PostScript, Encapsulated PostScript, PGML, or SVG. It can generate code for Java, C++, C#, PHP4, and PHP5, and its reverse-engineering framework supports Java source, JARs, and class files. Other capabilities include UML profiles, OCL constraint modeling with syntax and type checking, and background design critics that add suggestions to a to-do list. The interface is available in ten listed languages. ArgoUML is distributed under the Eclipse Public License 1.0 and runs on Windows, macOS, and Linux through a Java runtime.

Violet UML Editor is a free, open-source application for drawing simple UML diagrams quickly. It supports class, activity, object, sequence, state and use case diagrams. The project describes Violet as easy to learn and use, and intended for developers, students, teachers and authors who need straightforward UML diagrams. Violet is licensed under GNU General Public License version 2.0 (GPLv2) and is written in Java, with Java Swing and Java SWT listed as interfaces. Linux, Mac and Windows are named operating systems, while the platform listing also includes web. The source repository directs users to SourceForge for downloads. Building from source requires Java Development Kit 17 or greater and Maven 3 or greater; the repository specifies running `mvn clean package` from the root directory to compile and package the project. The maintainer invites contributors to submit pull requests and says requests will be examined before contacting contributors. Violet has one listed plan: free, described as a completely free, cross-platform UML editor. Deployment is listed as both, with web, Windows and Linux among supported platforms.