The Open & Agile Smart Cities (OASC) initiative is a global network of over 120 cities from 25+ countries working to establish common standards for smart city data sharing and services. OASC was founded in 2015 in Brussels and aims to build a global smart city market through lightweight implementation of open data services using common technologies. It is structured with a Board of Directors, Working Groups, city-led Council, and partnerships with other organizations. OASC has developed Models of Interoperability to facilitate data sharing across cities and open up new markets for smart city solutions while avoiding vendor lock-in.