Open Core is a licensing and business model used by many commercial open source companies. The model relies on the creation of two products. One product is the open source core project typically given away freely and the other is a closed source paid for product likely built upon the open source project.
One of the things you'd expect from an active open source project is that the code base is likely to grow as more and more features are added. Does a lack of growth imply that there is a functionality ceiling imposed on open core software?
Open core refers to a business strategy employed by some commercial open source companies. The open core strategy is popular amongst companies within network management.
