Confluent Platform is made up of:
- Apache Kafka (Apache 2.0 license), including Kafka Connect and Kafka Streams
- Some community-licensed pieces, such as ksqlDB, Schema Registry, and some of the connectors for Kafka Connect
- Some commercially-licensed components (such as tiered storage, Confluent Control Center, etc)
- For commercially-licensed components, you cam use trial for 30 days, or with the developer licence use them all forever, but only with a single Kafka broker