Is HANA supported only with SAP offered products?

No, It can be integrated or used with other products apart from SAP ones. The SAP HANA is an in-memory, relational database management system that is developed and marketed by SAP. It can be used as a tool to develop native applications and also as a standalone database for storing and retrieving data. In addition to these, it is also used as the database for many SAP business suite applications such as SAP S/4HANA, NetWeaver based applications, ECC, BW, Gateway, SCM, Enterprise Portal, and for many SAP offered products