OPNFV facilitates the development and evolution of NFV components across various open source ecosystems. Through system level integration, deployment and testing, OPNFV creates a reference NFV platform to accelerate the transformation of enterprise and service provider networks. The recently announced fourth release, Danube, represents a growing maturity for both the project and upstream partners and brings together elements across the stack to more quickly introduce technologies that meet the needs of operators. Join Tapio Tallgren, OPNFV TSC Chair, and Heather Kirksey, OPNFV Director, to learn how Danube, Euphrates, and the many rivers to come are helping to build the next-generation network for NFV.