UMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, buildsequence and activity diagrams from plain text, export diagrams to eps, pdf, jpg, svg, and clipboard,share diagrams using Eclipse, and create new, custom UML elements. UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux.
OpenProject is a web-based project management system for location-independent team collaboration. This open source application is released under the GNU General Public License Version 3 and is continuously developed by an active open source community. Since its inception, the speed of development and the number of developers of OpenProject exceeds the speed of its ancestor project Redmine by far.
In addition to numerous smaller OpenProject installations there are also some very large installations in global organizations with more than 2,500 projects.