ksqlDB license, foundation and stars
Streaming · Confluent Community License Agreement 1.0 (source-available) · backed by Confluent · 315 stars
The database purpose-built for stream processing applications.
License history
LICENSE file| Change | ||
|---|---|---|
| Dec 14, 2018 | Apache 2.0 to Confluent Community License Agreement 1.0KSQL moved from Apache 2.0 to the Confluent Community License, which bars competing SaaS offerings.LICENSE commitAnnouncement | LICENSE commitAnnouncement |
Latest release
No GitHub releases published; the project releases elsewhere (tags or its own site).
More in streaming
| Project | Stars | |||
|---|---|---|---|---|
 Apache KafkaApacheApache 2.0 | Apache 2.0 | 33.8k | +61 | - |
| Apache FlinkApacheApache 2.0 | Apache 2.0 | 26.4k | +18 | - |
 nsqMIT | MIT | 25.8k | - | - |
| Apache RocketmqApache 2.0 | Apache 2.0 | 22.6k | - | - |
 nats-serverApache 2.0 | Apache 2.0 | 20.8k | - | - |
 EMQXEMQ TechnologiesBUSL 1.1 | BUSL 1.1changed Apr 2025 | 16.8k | - | - |
| Apache PulsarApache 2.0 | Apache 2.0 | 15.3k | - | - |
 rabbitmq-serverCustom or mixed (see the LICENSE file) | Custom or mixed (see the LICENSE file) | 13.9k | - | - |
About and history
- Repository
- confluentinc/ksql · created Sep 27, 2016
- Website
- ksqldb.io
- Language
- Java
- Foundation
- None; run by Confluent
- Company
- Confluent · on Companies · on Acquisitions · on awards · on blogs · on certifications · on Attested · on Downtime · on Mainstage · on Leaders · on marketplaces · on Paydays · on Footprint · on Releases · on Nines · on Stories · on TechConf · on Titlewave · on training
- GitHub detects
- NOASSERTION (a custom or multi-license file; the license above is read from the file itself)
- Stars per week
- From the second weekly snapshot
Weekly snapshots
| Week of | Stars | |
|---|---|---|
| Sep 21, 2026 | 315 |
Changes
| What changed | |
|---|---|
| Sep 25, 2026 | RelicensedApache 2.0 to Confluent Community License Agreement 1.0 |
| Sep 25, 2026 | TrackedAdded: confluentinc/ksql |