.UML

.UML file extension

This is the basic program to work with .UML extension

StarUML

StarUML StarUML Project

StarUML is a fully fledged, open source, UML modeling tool that supports the ability to create software designs, from basic concepts, through to the coded solution. User should beware that this tool is more complex than a simple UML diagram editing tool, in that, through the use of the Model Drive Architecture (MDA) standard, the tool supports complex modeling which is realizable in code... (more)

The program works with the following extensions: uml

.UML extension is also supported by the following programs:

WinDev

WinDev WinDev/WebDev UML Model

Develop projects in Windows, Linux, .NET, Java, and other technologies.
Visual UML

Visual UML

You can migrate your projects to Visual Paradigm for UML.