A library to compress and uncompress arrays of integers very quickly.

Tablesaw Core

Pinot Core

Terrier Core

Geowave Data Adapter for Raster Data

A simple, fast and versatile Datalog database

Java dataframe and visualization library

Apache Kylin - Core Dictionary

SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision.

AdHoc

Kyligence Storage Parquet Format