CDS, BOPF, and Fiori App are all part of SAP's programming tools and technologies used in developing solutions on the S/4HANA platform. Developers can use these tools and technologies to build custom solutions on the S/4HANA platform. By leveraging these tools, developers can create efficient and scalable solutions that can help businesses to streamline their operations and improve user experience. Additionally, the use of these tools can help businesses to future-proof their solutions, making it easier to adapt to changing business needs and technologies.