If you are a business analyst and looking for a free and quick solution for graphical modeling (#BPMN 2.0, #CMMN and #DMN), BPMN.IO is a great tool.
No need to install, setup or register, just visit their website (www.bpmn.io, @bpmn_io by @CamundaBPM) and start modeling within your web browser.
Offline version is available, too.
Process models can be saved as .bpmn or exported as .svg format.
We are using it on some of our BPM workshops, which do not require BPM engine. Participants like to use it, because it doesn't require powerful PC.
The scrolling of the diagram is a little bit strange, but you can get used to it quickly.
What is even better: if you're a developer, you can extend it to fit your needs.
Happy process modelling!