"I didn't find any examples of another vendor who builds an OS application on an OSI-certified license and is making revenue through a SaaS delivery model." Who can help the lad out?

OSI has extensive experience in leveraging Esri GIS network models as an input to OSI's real-time OT solutions built on the monarch platform.

A tutorial on the Open Systems Interconnection (OSI) networking reference model plus tips on how to memorize the seven layers.