ClickHouse® is a real-time analytics database management system
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DuckDB is a high-performance analytical database system
OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.
An experimental embedded SQL engine in C++20. Query Parquet, CSV, JSON, Arrow, Avro, SQLite, and Excel files directly with SQL, in-process. Early-stage.