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Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics

An extensible, state-of-the-art framework for columnar compression, and the fastest FOSS columnar file format. Formerly at @spiraldb, now an Incubation Stage project at LFAI&Data, part of the Linux Foundation.

High-throughput columnar serialization in Rust

Apache ORC - the smallest, fastest columnar storage for Hadoop workloads

The open-source observability database. One columnar engine for metrics, logs, and traces, on object storage.

SIMD-accelerated columnar database for analytics — pure C, zero dependencies

New and extensible file format for storage of large columnar datasets.

A command-line tool for querying databases