Used by more than 60,000 data scientists at more than 7,000 organizations, H2O claims to be "the world's leading open source machine learning platform." Thanks to its in-memory technology, it offers extremely fast performance. It also integrates with many other open source data analytics tools like Hadoop and Spark, and it supports all of the most popular databases. Paid support is available.
In addition to the standard version of H2O, the company also offers Sparkling Water, a version that incorporates Spark, and Steam, and end-to-end artificial intelligence application engine.