Optimization of data storage

An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.

Apache Arrow is a multi-language toolbox for accelerated data interchange and in-memory processing

Hops Hadoop is a distribution of Apache Hadoop with distributed metadata.

BayesDB on SQLite. A Bayesian database table for querying the probable implications of data as easily as SQL databases query the data itself.