Hybrid deployments are the “Final Frontier” for serverless applications and microservices. As this Google Trends chart shows, there currently is no clear winner in terms of open source frameworks for hybrid deployments, with Google-backed Knative showing significant recent momentum. However, Knative should be considered serverless-middleware, “upgrading” standard Kubernetes to a framework for event-driven programming, but without adding developer tools found in higher-level platforms such as OpenWhisk or OpenFaaS.