ksqlDB

ksqlDB is a purpose-built database for stream processing applications. It allows you to build streaming applications using a familiar SQL-like syntax, which is then executed on top of Kafka Streams. It is designed to make stream processing accessible to a wider audience, including data analysts and developers who don't want to write complex Java code. ksqlDB can perform real-time joins, aggregations, and windowing directly on streaming data.

It is the perfect tool for building real-time materialized views and event-driven applications on top of a Kafka backbone.