Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

Core Hazelcast Module

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.

The central data model of the OpenStreetMap History Database.

Spark Project Core

AdHoc

Tablesaw is a dataframe and visualization library

Sidewinder Core

Database Engine for QWAZR

Spark Project Connect Client

Alibaba RSocket core module, includes network, routing, en/decoding etc