The Prometheus monitoring system and time series database.

Distributed reliable key-value store for the most critical data of a distributed system

CockroachDB - the open source, cloud-native distributed SQL database.

Scalable datastore for metrics, events, and real-time analytics

The MongoDB Database

An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.

Apache ZooKeeper

Graphs for Everyone

Mirror of Apache Cassandra

Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability