The product that has an open-source license in addition to having a non-relational system is MongoDB. Since, MongoDB is an open-source database that uses a document-based model instead of a traditional relational model. It is licensed under the GNU Affero General Public License v3.0, which means that the source code is freely available to the public and can be modified and distributed by anyone. This open-source license allows developers to build and customize applications using MongoDB without having to pay licensing fees. At the same time, MongoDB also offers a commercial license for enterprises that require additional support and features.