CKAN (Comprehensive Knowledge Archive Network) is an open-source data portal platform that provides an out of the box solution for managing, transferring, and accessing data. CKAN operates under a SaaS model and was created to help data publishers make their data open and available. The CKAN platform contains a catalog system with a web interface, data visualization and analytics, workflow support, access control, data storage, and federated structure.
The web service is broken down into two distinct parts: Search and Model. The Search API exposes methods for searching resources, datasets, and revisions, as well as tag counts. The Model API provides a variety of GET, POST, and PUT operations for manipulating, creating, and retrieving model resources from the platform.
The next generation of smart city applications and user interfaces are beginning to emerge based on the European-initiated FIWARE open API platform. The platform provides an open source toolkit of APIs and backend infrastructure components that enable app developers to create new city solutions.