Nussknacker is a low-code platform for building decision logic on real-time data, executed on Apache Flink. Business teams assemble the logic visually while engineers set up the integrations. The platform offers a drag-and-drop job builder, SpEL expressions for conditions, deployment to Flink with testing and rollback, Flink SQL, aggregations with time windows, machine-learning model inference and built-in observability. The source code is licensed under Apache-2.0. You run it yourself with Docker or Kubernetes, or use Nu Cloud as a hosted offering.
Nussknacker comes from TouK, a company in Warsaw, Poland, that focuses on JVM and data engineering; no parent company outside the EU has been identified. When you self-host, data stays entirely in your own environment. For Nu Cloud, the pages consulted state no hosting region, so you would need to ask the vendor. The website itself uses services such as Amazon Web Services and CloudFront. For a European organisation this is an open-source option that can run on its own infrastructure, with an EU vendor for support.