Papyrus is an open source modeling tool that is part of the Eclipse Ecosystem. Those working with Eclipse or those looking for a platform solution may want to have a close look at it.
Papyrus is an amazing project. If anything, my comment pinpoints the high expectations we have for open source these days. (Dr. Michael Jastram)Read the full article: Will UML Modeling with Papyrus be a success in 2016 and beyond?