Modelio is an open source modeling environment tool providing support for the latest standards (UML 2, BPMN 2, ...). It can be extended by adding modules which add new functionalities. A large set of modules (free and open source) supporting code management (generation/reverse), modeling standards (TOGAF, SysML, SoaML, ...), document generation, ... is available from the Modelio Store (http://store.modeliosoft.com/).
Need help or want to share experience with the Modelio community? Go to our forum: http://www.modelio.org/forum/index.html.