Redpanda
Kafka API-compatible streaming data platform written in C++ (no JVM, no ZooKeeper). Self-described as an "Agentic Data Plane and Data Streaming platform for real-time performance, AI innovation, and simplified operations." Ships Redpanda Connect (integration), Redpanda SQL (query engine, post Oxla acquisition), and Redpanda Cloud (managed SaaS). Source-available under the Business Source License.