#olap

spiculedata/saiku

Java

92

health

Open-source semantic layer: one cube for Excel (MDX/XMLA), dashboards, and AI agents (MCP). Mondrian + Apache Calcite.

paradedb/paradedb

Rust

88

health

One Postgres for your application data, full-text search, vector retrieval, and aggregations. Home of the pg_search extension.

StarRocks/starrocks

Java

87

health

The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.

ClickHouse/ClickHouse

C++

86

health

ClickHouse® is a real-time analytics database management system

Basekick-Labs/arc

Go

85

health

Open, SQL-native time-series database for telemetry you need to keep. 34M+ records/sec ingestion, 8M+ rows/sec queries. InfluxDB Line Protocol and Telegraf compatible. Open Parquet on your storage. Single binary. S3/Azure native. Air-gap ready. AGPL-3.0.

apache/datafusion

Rust

84

health

Apache DataFusion SQL Query Engine

serenedb/serenedb

C++

77

health

The First Real-Time Search Analytics Database