Open-source OLAP database designed for real-time analytics at scale.

49.5k stars8.9k forksApache-2.0last commit Actively maintained
Managed cloud-hosted ClickHouse service: a high-performance columnar SQL OLAP database for real-time analytics and reporting. Provides serverless/elastic scaling, automated replication and backups, ingestion integrations, interactive SQL console, APIs and Terraform.
Open-source OLAP database designed for real-time analytics at scale.

49.5k stars8.9k forksApache-2.0last commit Actively maintained
InfluxDB is an open source time-series database for high-ingest metrics and event data, enabling fast queries for monitoring, dashboards, and real-time analytics.

31.7k stars3.7k forksApache-2.0last commit Actively maintained
Apache Druid is a real-time analytics (OLAP) database delivering sub-second queries on streaming and batch data with high concurrency at scale.

14k stars3.8k forksApache-2.0last commit Actively maintained
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 3 of 3 shipped a commit in the last six months. Licences in this list: Apache-2.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in Time-Series Databases.