Más is a Web-based workbench for domain modeling. It is a tool that is primarily intended for domain stakeholders and business analists wanting to capture and empower their domain knowledge. This works as follows:

domain-specific modeling language domain models derived assets

The last step of this process is called Activation and can be thought of as "running the model". Go to the Information pages for more details.
To get an impression of how modeling, pick a language from the Language Marketplace below and press the example button to view an editable example model and its Activations, or press the structure button to view the language's structural definition.

Sign up below for private β access (free of charge). If you already have an approved subscription you can click the right button to go to the workbench.