The concept of PlanQK aims to develop an open platform and ecosystem for quantum applications. This will create and foster a community of quantum computing specialists, developers of concrete applications, as well as users, customers, service providers and consultants. The PlanQK platform serves as the technical basis for building this quantum computing community. Central components are algorithms, applications and data pools from various sources such as the web, published articles or books. The platform enables these algorithms and data to be distributed and sold through the community. The algorithms and data pools are stored in a special database called PlanQK Algorithm & Data Content Store. The community and the platform operator's specialists can access this database, analyze, clean and unify the algorithms and data. Quality-checked algorithms and data pools are stored in the PlanQK Community Platform. The data pools provide quality assurance and validation by allowing customers and the community to compare different algorithms. Based on the quality-assured algorithms, developers can implement them for execution on a quantum computer. These programs, called Quantum Services, are also quality-assured and stored in the PlanQK Quantum Service Store. Customers can search for algorithms and data in this store and purchase them or use them for free. Similarly, programs implementing such algorithms can be searched for, purchased or used free of charge. If a particular algorithm or data pool is not found or implemented by a program, customers can make requests to the community, service providers, or the platform operator. In case of a purchase, the algorithm, the program and, if applicable, the corresponding data are automatically packaged and transmitted to the quantum computer. Invoicing for the resources used also takes place via the platform.