ClickHouse.

Open-source column-store database for fast analytical queries (Yandex origin)

Facts

CrateDB
Distributed SQL database optimised for machine data and IoT applications
AT · open-source
↗
DuckDB
In-process analytical database, the SQLite for OLAP, developed in the Netherlands
NL · open-source
↗
MariaDB
open-source relationele database, community-gedreven fork by MySQL
FI · open-source
↗
Meilisearch
Open-source search engine written in Rust, fast and easy to integrate
FR · open-source
↗
Neo4j
Leading graph database for connected-data applications, originally from Sweden
SE · open-source
↗
TimescaleDB
Open-source time-series database as PostgreSQL extension for time-series workloads
SE · open-source
↗
Valkey
Open-source in-memory key-value store, community fork of Redis under the Linux Foundation
SE · open-source
↗
Aiven
Managed open-source data infrastructure (PostgreSQL, Kafka, OpenSearch) in the cloud
FI · commercial
↗