One part of MOSART is an application called NetScene. It is a tool for creating, editing, and executing scenarios in the testbed and is especially developed with distributed simulation in mind. Its main features are that it uses an XML based scenario format, that it has a GUI for adding, editing, and removing entities and paths, and that it connects to other parts of the MOSART testbed, such as HLA (High Level Architecture), which relates to real-time processing.
Here's a screenshot to give an impression of what NetScene is, i.e., an application created atop the NetBeans Platform:
These developments and the documents referred to above were created in co-operation with the Swedish Armed Forces in 2005 and 2006.