Apache Spark - A unified analytics engine for large-scale data processing

In-memory dimensional time series database.

Scala based HDL

GeoMesa is a suite of tools for working with big geo-spatial data in a distributed fashion.

CPU and GPU-accelerated Machine Learning Library

Distributed Neural Networks for Spark

Open source machine learning accelerators

Apache Daffodil

Build stuff from simple voxels. Uses scala.js & three.js. Requires webgl. See