An open source implementation of the OMG Foundational Semantics for Executable UML models (fUML) specification available on GitHub
Did you know you can write textual UML models with Emacs (and generate the corresponding diagrams automatically)? Check this Emacs mode for sequence diagrams
Easy way to browse and visualize the UML notation specification
xtUML is a new open source solution for executable UML based on the well-known BridgePoint tool. Beyond a model editor, it includes several model compilers
Maybe developers do not (all) use UML but it looks like screenwriters do. Check the video!
Read what Grady Booch (creator of the UML) has to say about modeling, MDD and software development in general
Draw diagrams online with this install-free browser UML tool aimed at quickly drawing UML sketches (even mixing elements from different UML "diagrams" )
Read why and how nomnoml (our latest addition to the ever-growing list of textual UML tools) was created
The evolution of a cloud-based UML modeling tool. Read why and how GenMyModel has evolved to match the needs of online modeling users.
Looking for a tool to help you evaluate the quality of your models?. Give EMFtoCSP a try, and even better, help us to make it better!