Systems for distributed data storage. A user accesses a user interface in a distributed virtualization system comprising computing nodes that support virtualized controllers that include preconfigured APIs to receive application extension modules. The system receives a user command from a user interface at the virtualized controller, the user command corresponding to a download request for at least one application extension. A successful download and integration event causes integration of the containerized application extension into the system. The additional functionality of the containerized application extension is offered to the user. The user can address additional functionality of the containerized application extension through a user interface.