From OpenSCADAWiki
Creation in the sources tree of the OpenSCADA project
It makes sense to create new modules in the sources tree of OpenSCADA project in case of further plans for the transfer of the new module to the OpenSCADA project. Since the module should not be contrary to the spirit of the open source project and license on the basis of which OpenSCADA is developed and distributed, license of the new module obviously should be one of the free licenses.