ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages.

Features:
1. All 9 UML 1.4 Diagrams supported
2. Platform Independent: Java 5+
3. Click and Go! with Java Web Start
4. Standard UML 1.4 Metamodel
5. UML Profile support with profiles provided
6. XMI Support
7. Export Diagrams as GIF, PNG, PS, EPS, PGML and SVG
8. Available in ten languages - EN, EN-GB, DE, ES, IT, RU, FR, NB, PT, ZH
9. Advanced diagram editing and Zoom
10. OCL Support
11. Forward Engineering
12. Reverse Engineering / Jar/class file Import

ArgoUML is a powerful yet easy-to-use interactive, graphical software design environment that supports the design, development and documentation of object-oriented software applications. If you are familiar with a family of software applications called Computer Aided Software Engineering (CASE) tools then you should find ArgoUML instantly familiar.

The users of ArgoUML are software designers & architects, software developers, business analysts, systems analysts and other professionals involved in the analysis, design and development of software applications.

Main features:
1. Open standards: XMI, SVG and PGML
2. 100% Platform independent thanks to the exclusive use of Java
3. Open Source, which allows extending or customizeing.
4. Cognitive features like: reflection-in-action, opportunistic design, comprehension and problem solving

The license of this software is Freeware, you can free download and free use this flowchart & diagram software.